Switching users causes screen display issues

I've had a new MacBook Pro 2011 that came with Lion on it. It's been working well, I migrated my old user accounts from my previous MacBook with Snow Leopard on it.
After having it a few weeks my son tried using the fast user switching and going into his account but the screen was exteremly glitchy. It basically show what looked like my users screen and would erase and paint with his correct screen as he dragged windows around. Eventually his screen would like correct then spontantously revert to showing my screen again.
Fast user switching back to my account showed everything correctly. Logging us both out and logging him in alone works fine. Logging him in first and then switching to my user gives me the problem he experienced of seeing mostly his screen and having to drag screens around causing re-painting to show my proper screen.
Screen refresh issue aside if we can work through messed up screens the computer appears to be working fine, apps launch properly and no sign of any memory or file corruption, everything "works" properly.
I tried completely removing and re-creating his account but the problem remains.
Couple of factors in case they are relevant.
1) We upgraded the HDD to a SDD but it shows not signs of any issues
2) We upgraded the memory beyond the normal limit of 8gb to 16gb using a Cruicial memory kit certified for the MacBook Pro.
3) We have both the laptop screen 1680x1050 running and an attached thunderbolt display AND a usb DisplayLink adapter to a 3rd Dell 1600x1200 monitor.
My intial thoughts were with the DisplayLink adapter. I made sure to get the latest drivers from the display link web site and did some searches but no one has described my problem.
The screen issue seems to present itself mainly on the "main monitor" the 27" thunderbolt display but we have seen some screen corruption on the MacBook LCD. Oddly the DisplayLink always appears correct.
Anyone have any ideas?
System Version:          Mac OS X 10.7.3 (11D50b)
Kernel Version:          Darwin 11.3.0
Boot Volume:          Macintosh SSD
Boot Mode:          Normal
Secure Virtual Memory:          Enabled
64-bit Kernel and Extensions:          Yes
Time since boot:          21:31

As a followup. Experimenting seems to suggest that removing the driver for DisplayLink cures the issue. Going to test more with reinstalling the driver and just unplugging the USB cable before switching.
Was also seeing (before uninstall) issues with getting a Beach Ball freeze during logout of the 2nd user.
I want to be certain of if it's the DisplayLink driver but once I am certain I'll take my gripe to their support forum.

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0E7247ABF86E
Wed Aug 27 13:47:26 2014
Machine-check capabilities: 0x0000000000000c09
family: 6 model: 42 stepping: 7 microcode: 40
signature: 0x206a7
Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
9 error-reporting banks
Processor 0: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f81890b5f
IA32_MC3_MISC(0x40f):   0x000000000003ffff
Processor 1: IA32_MCG_STATUS: 0x0000000000000005
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f81890b5f
IA32_MC3_MISC(0x40f):   0x000000000003ffff
Processor 2: IA32_MCG_STATUS: 0x0000000000000005
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f82b44482
IA32_MC3_MISC(0x40f):   0x000000000003ffff
Processor 3: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f82b44482
IA32_MC3_MISC(0x40f):   0x000000000003ffff
panic(cpu 1 caller 0xffffff8000cdcad9): "Machine Check at 0x00007fff8c94b14a, registers:\n" "CR0: 0x0000000080010033, CR2: 0x00000001084a1000, CR3: 0x0000000045bac03a, CR4: 0x00000000000606e0\n" "RAX: 0x0000000000000000, RBX: 0x00007f993c100000, RCX: 0x00000000000002e5, RDX: 0x0000000000000008\n" "RSP: 0x00007fff5a355610, RBP: 0x00007fff5a355620, RSI: 0x00007f993c12e480, RDI: 0x000000010589f000\n" "R8: 0x00007f993c100000, R9: 0x00000000000002e4, R10: 0x0000000000001955, R11: 0x0000000000000000\n" "R12: 0x00007f993c12e480, R13: 0x000000010589f000, R14: 0x0000000000000000, R15: 0x00000000000275b4\n" "RFL: 0x0000000000000206, RIP: 0x00007fff8c94b14a, CS: 0x000000000000002b, SS: 0x0000000000000023\n" "Error code: 0x0000000000000000\n"@/SourceCache/xnu/xnu-2422.110.17/osfmk/i386/trap_native.c :168
Backtrace (CPU 1), Frame : Return Address
0xffffff81edc13dd0 : 0xffffff8000c22f79
0xffffff81edc13e50 : 0xffffff8000cdcad9
0xffffff81edc13fb0 : 0xffffff8000cf3fef
BSD process name corresponding to current thread: WindowServer
Mac OS version:
13E28
Kernel version:
Darwin Kernel Version 13.3.0: Tue Jun 3 21:27:35 PDT 2014; root:xnu-2422.110.17~1/RELEASE_X86_64
Kernel UUID: BBFADD17-672B-35A2-9B7F-E4B12213E4B8
Kernel slide:     0x0000000000a00000
Kernel text base: 0xffffff8000c00000
System model name: iMac12,2 (Mac-942B59F58194171B)
System uptime in nanoseconds: 603458021016
last loaded kext at 243321867094: com.apple.filesystems.msdosfs 1.9 (addr 0xffffff7f833bc000, size 65536)
last unloaded kext at 368833330215: com.apple.filesystems.msdosfs 1.9 (addr 0xffffff7f833bc000, size 57344)
loaded kexts:
com.apple.driver.AudioAUUC 1.60
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.iokit.IOBluetoothSerialManager 4.2.6f1
com.apple.filesystems.autofs 3.0
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com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleMikeyDriver 2.6.3f4
com.apple.driver.AppleUpstreamUserClient 3.5.13
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.kext.AMDFramebuffer 1.2.4
com.apple.driver.AppleHDA 2.6.3f4
com.apple.driver.AppleIntelHD3000Graphics 8.2.4
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.6f1
com.apple.AMDRadeonX3000 1.2.4
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleThunderboltIP 1.1.2
com.apple.driver.AppleSMCPDRC 1.0.0
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleLPC 1.7.0
com.apple.driver.AppleIntelSNBGraphicsFB 8.2.4
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.kext.AMD6000Controller 1.2.4
com.apple.driver.AppleBacklight 170.3.5
com.apple.driver.AppleMCCSControl 1.2.5
com.apple.driver.AppleUSBCardReader 3.4.1
com.apple.driver.AppleIRController 325.7
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.iokit.SCSITaskUserClient 3.6.6
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.0
com.apple.driver.AppleUSBHub 683.4.0
com.apple.iokit.AppleBCM5701Ethernet 3.8.1b2
com.apple.driver.AirPort.Atheros40 700.74.5
com.apple.driver.AppleFWOHCI 5.0.2
com.apple.driver.AppleAHCIPort 3.0.5
com.apple.driver.AppleUSBEHCI 660.4.0
com.apple.driver.AppleACPIButtons 2.0
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
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com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 217.92.1
com.apple.nke.applicationfirewall 153
com.apple.security.quarantine 3
com.apple.driver.AppleIntelCPUPowerManagement 217.92.1
com.apple.iokit.IOSerialFamily 10.0.7
com.apple.kext.triggers 1.0
com.apple.iokit.IOSurface 91.1
com.apple.driver.DspFuncLib 2.6.3f4
com.apple.vecLib.kext 1.0.0
com.apple.iokit.IOAudioFamily 1.9.7fc2
com.apple.kext.OSvKernDSPLib 1.14
com.apple.iokit.IOBluetoothFamily 4.2.6f1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.6f1
com.apple.iokit.IOAcceleratorFamily 98.22
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.AppleThunderboltEDMSink 2.1.3
com.apple.driver.IOPlatformPluginFamily 5.7.1d6
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.driver.AppleSMC 3.1.8
com.apple.kext.AMDSupport 1.2.4
com.apple.AppleGraphicsDeviceControl 3.6.22
com.apple.driver.AppleHDAController 2.6.3f4
com.apple.iokit.IOHDAFamily 2.6.3f4
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.iokit.IONDRVSupport 2.4.1
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com.apple.iokit.IOGraphicsFamily 2.4.1
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com.apple.driver.AppleThunderboltDPAdapterFamily 3.1.7
com.apple.driver.AppleThunderboltPCIDownAdapter 1.4.5
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com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.5.1
com.apple.iokit.IOFireWireSBP2 4.2.6
com.apple.driver.AppleUSBMergeNub 650.4.0
com.apple.driver.AppleUSBComposite 656.4.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.6
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOAHCISerialATAPI 2.6.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.6
com.apple.driver.AppleThunderboltNHI 2.0.1
com.apple.iokit.IOThunderboltFamily 3.3.1
com.apple.iokit.IOUSBUserClient 660.4.2
com.apple.iokit.IOEthernetAVBController 1.0.3b4
com.apple.driver.mDNSOffloadUserClient 1.0.1b5
com.apple.iokit.IO80211Family 640.36
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IOAHCIFamily 2.6.5
com.apple.iokit.IOUSBFamily 683.4.0
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 278.11.1
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com.apple.security.TMSafetyNet 7
com.apple.driver.AppleKeyStore 2
com.apple.driver.DiskImages 371.1
com.apple.iokit.IOStorageFamily 1.9
com.apple.iokit.IOReportFamily 23
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 2.0
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com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0
com.apple.kec.pthread 1
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Graphics: AMD Radeon HD 6970M, AMD Radeon HD 6970M, PCIe, 2048 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3035312E4130304C4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393955353432382D3034322E413030472020
Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393955353432382D3034322E413030472020
Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3035312E4130304C4620
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0-P2P
Bluetooth: Version 4.2.6f1 14216, 3 services, 15 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: WDC WD1001FALS-403AA0, 1 TB
Serial ATA Device: KINGSTON SH103S3480G, 480,1 GB
Serial ATA Device: OPTIARC DVD RW AD-5680H
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Ext HDD 1021
USB Device: USB2.0 Hub
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: USB Device
USB Device: Razer Arctosa
USB Device: Internal Memory Card Reader
USB Device: IR Receiver
FireWire Device: My Book 111D, WD, Up to 800 Mb/sec
Thunderbolt Bus: iMac, Apple Inc., 22.1

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When waking my Macbook up after it has slept, the lock screen sometimes appears as below, with the left hand side appearing as fragmented lines and the right normally, save for the fact that the blurred image is not my current desktop background. At other times the lock screen will appear as normal, but with the incorrect blurred image. However, it will also appear totally normally with the correct blurred background too at times, with no discernible reason for any of the variations. I have tried changing the desktop background to see if that would help at all but it did not seem to make a difference. Any ideas??

The next time the problem happens, note the date and time the problem occurred, then go to Applications/Utilities/Console and copy the log starting at the time of the crash. Paste the log in a reply. Please do not use a screen shot as they can be hard to read. If there are repeated runs of the same messages, please post only one run. Be selective about what you post and don’t post huge amounts. Make sure there is no personal data visible. Information learned from Linc Davis.

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Hey guys,
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Switching users causes screen display issues

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