Reboot after safe mode

I rebooted in safe mode (OS-X Yosemite) to troubleshoot a problem (the com.apple.mdworker.bundles issues) and after rebooting in normal mode the App Memory is double than before booting in safe mode. Before App Memory was about 1.5 GB's with the basic stuff open, but after going through safe mode, the App Memory is now around 3 GB's, but there doesn't seem to be anything unusual in the Acitivity Monitor showing the new app memory. It's not a problem since the Mac Pro has 32 GB's but still it's a "Huh?" moment. Any ideas what happened or where to look for clues?

Sorry, misunderstood. Reboot into Safe Mode and see what it is, then back. Superficially, this means nothing. But you need to do it under the exact same conditions. For example, run no applications or utilities after the reboots (except Activity Monitor.) Many third-party items you may have installed will not normally run in safe mode, and that can account for a drop in total memory usage. Look at the memory info reported in Activity Monitor in order to compare. If there is anything unusual, it should become obviou    

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    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.6
    com.apple.iokit.IOPCIFamily          2.7
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    System Profile:
    Model: MacBookPro5,3, BootROM MBP53.00AC.B03, 2 processors, Intel Core 2 Duo, 2.66 GHz, 4 GB, SMC 1.30f3
    Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB
    Graphics: NVIDIA GeForce 9600M GT, NVIDIA GeForce 9600M GT, PCIe, 256 MB
    Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
    Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.81.20)
    Bluetooth: Version 4.0.9f8 10405, 2 service, 11 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en1
    Serial ATA Device: Hitachi HTS545032B9SA02, 320,07 GB
    Serial ATA Device: MATSHITADVD-R   UJ-868
    USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0x24400000 / 2
    USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0237, 0x04600000 / 3
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26500000 / 2
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8213, 0x06110000 / 5
    Thanks!

    The last gasp is an OSX reinstall.  If that fails, then the genius bar is the best option.
    Ciao.

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