I have 10.6.7. installed. I have not been tinkering with the system for a few months now, and the most I did was change icons, do some basic terminal commands, and change the dock. The problems started yesterday. I tried opening Mactracker from the App Store (I had used the latest update before) and it crashed immediately. I then tried opening Chrome and it crashed immediately too. I then deleted them, deleted their preferences and application support folders from ~/Library/ and re-download them, but they still crashed. I tried opening the Unix file from Chrome/Contents/Mac OS and it crashed too. Today I noticed that flash stopped working for well (in Firefox it just disappears, Safari it says "Plug-in Failure", and Opera crashes if there is even 1 piece of flash content on the page). I un-installed Flash from the app from the Adobe website, repaired disk permissions, and re-installed Flash. Still won't work. Firefox (Beta), Safari, Opera, System Preferences, Store News, App Store, Photoshop CS4, TextEdit, (Firefox) Nightly, Preview, and the Runescape Game Client are the apps I can remember opening since the problem started, and all of those have no problems. I have not restarted (I have a fear of restarting laptops with hard drives), but will do so if you think it will work.