Hi, I'm hoping someone could shed some light on an odd issue that I'm experiencing. Several applications on my mac keep uninstalling themselves, even whilst In use. For example: I was using firefox, then navigation bar seemed to lock up, so I quit Firefox, then it removed itself from the dock bar - I looked in my applications folder and it was no longer there? Had to download and reinstall to get it working again. Was using photoshop CS4, click 'save for web' and a popup told me it was unable to export as file didn't exist? So I saved my file i was working on, quit photoshop, looked in my applications folder and the entire CS4 package was missing?! To restore this, I opened Time Machine, and found that it had been missing for 3 hours, so restored the Adobe suite (7gb) and it now works again. This has happened to about 8 applications now, cyberduck, carbon copy cloner, adium, appzapper, automater, firefox, adobe? I've ran a disk check on my hard drive and all seems fine, no errors found. I'm also experiencing complete freezes every so often where I'm forced to hold the power button down to turn my mac off and then reboot it - all since this error started happening. I have a Macbook Pro, 17" 2.4ghz, 4gm ram running OS X 10.5.7 Does anyone have any idea what might be going on? Thanks in advance, J.