This is from MacFixIt:\n\nUsers of Intego VirusBarrier software may experience system freezes upon\nTime Machine activation. The system seems to lock up with no error\nmessages and complete lack of responsiveness, and requires a manual\nreset to get functional again. This may occur when users perform a\nbackup, or it may occur when users try to access their backups.\nAs described by Apple Discussions poster clintbradford:\n\n"Finally upgraded to Leopard on my 17" MBP. All went well except for\nTime Machine freezing when I tried to access it. Initial backup went\nfine...and so have a few hourly incremental backups. But when I tried to\naccess to see what it had performed - freeze-up. Had to force quit it."\nTime Machine has problems with many antivirus software packages, and\nwhile disabling or uninstalling the software seems to be a quick fix, a\nchange of settings may enable the virus protection to run in tandem with\nTime Machine. While the following fix is specific to VirusBarrier\nsoftware, setting up other virus protection to avoid the Time Machine\ndrive may also help if users are experiencing problems with Time Machine\nas well.\n\nFix: Set the Time Machine disk to the "Trusted Zone" in Intego\nVirusBarrier Open the VirusBarrier software and in the preferences go to\nthe "Scanner" section and add the Time Machine drive to the "Trusted\nZone" section. You may have to set the mode to "Interactive" under the\n"Mode" menu to make these settings available.