Stall or freeze on switching between dual displays

Sometimes when I click from one of my dual displays to another, my computer freezes. It only started happening recently. I pulled my video card out and put it back in one day, and ever since then it does this. Also, its not like the computer completely freezes. Anything that happens via internet (ie internet radio) does not stop playing.
Since this started happening, I have replaced my video card, cleaned the internals of my computer with compressed air, installed an extra fan, and reinstall the graphics utilities.
My video card was a radeon 9600, now its a 9800 pro. Computer is a G4 2x1.25GHz, OSX 10.4.11

"when I click from one of my dual displays to another..."
I do not understand what that means.
Could you please describe, in excruciating detail, how to "click from one display to the other"?

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Interval Since Last Panic Report: 182041 sec
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Anonymous UUID:                    0577657F-1C3E-4F99-8D46-DBE4A8F848D3
Mon Dec 12 20:45:18 2011
panic(cpu 0 caller 0xffffff7f81f5bc8c): "AGC GPU REGISTER RESTORE FAILED : rdar://7254528"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.0.16/s rc/AppleMuxControl/kext/AGCPowerManagement.cpp:928
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0xffffff807f8d3f20 : 0xffffff7f81f5fa0f
0xffffff807f8d3f40 : 0xffffff800063c091
0xffffff807f8d3f70 : 0xffffff800023db2c
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Darwin Kernel Version 11.2.0: Tue Aug 9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64
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last unloaded kext at 42845253273: com.parallels.kext.prl_hypervisor          7.0 14922.693916 (addr 0xffffff7f8205c000, size 360448)
loaded kexts:
com.paragon-software.filesystems.ntfs          82
com.parallels.kext.prl_hid_hook          7.0 14922.693916
com.parallels.kext.prl_hypervisor          7.0 14922.693916
com.parallels.kext.prl_usb_connect          7.0 14922.693916
com.parallels.kext.prl_vnic          7.0 14922.693916
com.parallels.kext.prl_netbridge          7.0 14922.693916
at.obdev.nke.LittleSnitch          2.4.4
com.apple.driver.AppleHWSensor          1.9.4d0
com.apple.filesystems.autofs          3.0
com.apple.driver.AudioAUUC          1.59
com.apple.driver.AppleTyMCEDriver          1.0.2d2
com.apple.driver.AGPM          100.12.42
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleHDA          2.1.3f7
com.apple.driver.AppleMikeyDriver          2.1.3f7
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.AppleMCCSControl          1.0.26
com.apple.kext.ATIFramebuffer          7.1.4
com.apple.driver.AppleIntelHD3000Graphics          7.1.4
com.apple.driver.SMCMotionSensor          3.0.1d2
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.driver.AppleSMCLMU          2.0.1d2
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.2.1
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.5d4
com.apple.driver.AppleMuxControl          3.0.16
com.apple.driver.AppleLPC          1.5.3
com.apple.driver.AppleBacklight          170.1.9
com.apple.ATIRadeonX3000          7.1.4
com.apple.driver.AppleUSBTCButtons          225.2
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.driver.AppleIRController          312
com.apple.driver.AppleUSBTCKeyEventDriver          225.2
com.apple.driver.AppleUSBTCKeyboard          225.2
com.apple.iokit.SCSITaskUserClient          3.0.1
com.apple.iokit.IOAHCIBlockStorage          2.0.1
com.apple.driver.AppleUSBHub          4.5.0
com.apple.driver.AppleFWOHCI          4.8.9
com.apple.driver.AirPort.Brcm4331          512.20.18
com.apple.iokit.AppleBCM5701Ethernet          3.0.8b2
com.apple.driver.AppleEFINVRAM          1.5.0
com.apple.driver.AppleAHCIPort          2.2.0
com.apple.driver.AppleUSBEHCI          4.5.5
com.apple.driver.AppleUSBUHCI          4.4.5
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleACPIButtons          1.4
com.apple.driver.AppleRTC          1.4
com.apple.driver.AppleHPET          1.6
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.4
com.apple.driver.AppleAPIC          1.5
com.apple.driver.AppleIntelCPUPowerManagementClient          167.1.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1
com.apple.driver.AppleIntelCPUPowerManagement          167.1.0
com.apple.kext.triggers          1.0
com.apple.driver.AppleAVBAudio          1.0.0d11
com.apple.driver.AppleHDAHardwareConfigDriver          2.1.3f7
com.apple.driver.DspFuncLib          2.1.3f7
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOSurface          80.0
com.apple.iokit.IOBluetoothSerialManager          4.0.1f4
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.iokit.IOFireWireIP          2.2.4
com.apple.iokit.IOAVBFamily          1.0.0d22
com.apple.driver.AppleHDAController          2.1.3f7
com.apple.iokit.IOHDAFamily          2.1.3f7
com.apple.iokit.IOAudioFamily          1.8.3fc11
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.ApplePolicyControl          3.0.16
com.apple.driver.AppleSMC          3.1.1d8
com.apple.driver.IOPlatformPluginFamily          4.7.5d4
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleGraphicsControl          3.0.16
com.apple.driver.AppleBacklightExpert          1.0.3
com.apple.driver.AppleThunderboltEDMSink          1.1.3
com.apple.driver.AppleThunderboltEDMSource          1.1.3
com.apple.driver.AppleThunderboltDPOutAdapter          1.5.8
com.apple.iokit.IONDRVSupport          2.3.2
com.apple.kext.ATI6000Controller          7.1.4
com.apple.kext.ATISupport          7.1.4
com.apple.driver.AppleIntelSNBGraphicsFB          7.1.4
com.apple.iokit.IOGraphicsFamily          2.3.2
com.apple.driver.AppleFileSystemDriver          13
com.apple.driver.AppleThunderboltDPInAdapter          1.5.8
com.apple.driver.AppleThunderboltDPAdapterFamily          1.5.8
com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.1
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.1f4
com.apple.driver.AppleUSBBluetoothHCIController          4.0.1f4
com.apple.iokit.IOBluetoothFamily          4.0.1f4
com.apple.driver.AppleUSBMultitouch          227.1
com.apple.iokit.IOUSBHIDDriver          4.4.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.1
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.7
com.apple.iokit.IOCDStorageFamily          1.7
com.apple.driver.AppleUSBMergeNub          4.5.3
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.driver.XsanFilter          403
com.apple.iokit.IOAHCISerialATAPI          2.0.1
com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.1
com.apple.driver.AppleThunderboltNHI          1.3.2
com.apple.iokit.IOThunderboltFamily          1.7.4
com.apple.iokit.IOUSBUserClient          4.5.3
com.apple.iokit.IOFireWireFamily          4.4.5
com.apple.iokit.IO80211Family          411.1
com.apple.iokit.IOEthernetAVBController          1.0.0d5
com.apple.iokit.IONetworkingFamily          2.0
com.apple.iokit.IOAHCIFamily          2.0.7
com.apple.iokit.IOUSBFamily          4.5.5
com.apple.driver.AppleEFIRuntime          1.5.0
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          165.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          331
com.apple.iokit.IOStorageFamily          1.7
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.4
com.apple.iokit.IOPCIFamily          2.6.7
com.apple.iokit.IOACPIFamily          1.4
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I'm fairly technical but this is overkill even for me. I managed by googling "AGC GPU REGISTER RESTORE FAILED" to find a japanese blog that helped me fix the problem but it's only partially solved. I'm not getting any kernel panic attacks by switching of the integrated graphics under "Energy Saver" in system prefs but instead getting decreased battery life as the computer is constantly using the dedicated graphics card. So in other words when I untick the "Automatic Graphics Switching" the problem is gone.
I always get the same report and it doesn't really matter if I'm pushing the machine to it's limits or just writing something in TextEdit. When speaking to Apples support advisors they implied that it's most likely not hardware related but software related. I personally think that it's most likely the driver related and could be fixed by modifying the AppleGraphicsControl.kext file but I can't be sure. I've never modified a kext file before and feel a bit uncomfortable doing it without any assistance.
Could anyone please give me some advice. It would be sincerely appreciated.
Thanks
PS. Forgot to add that I've reinstalled Lion several times, reset SMC, PRAM, etc. None of that worked.

I had to send my MB Pro to an authorized apple service provider where they ran diagnostic tests on it and concluded that it was the logic board (motherboard) that was as seeehr germans would put it "kaput". After they replaced it with a new one and re-did the tests everything worked fine. So in my opinion waiting for a SW update to fix the issue one would have to wait an eternity. Just let the technicians take a look at it and they'll most likely replace the logic board or the entire computer depending on what makes most sense for them.
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