I've been happily using Aptana for a PHP project. As of yesterday evening, it's been crashing repeatedly and causing no end of grief!
I can pinpoint two events which may have caused this:

Yesterday evening I seem to have hit a combination of keyboard keys which has resulted in 'Python not configured' appearing at the top of the App explorer window. I can't see anyway to turn Python off.
I have also been trying to get Git to behave, and (away from Aptana) have been making changes to TortoiseGit and installing SmartGit.

Any ideas? (Specifically, can I turn off Python somehow to see if this helps?)
i suggest you to click on:
HELP -> About Aptana
then: Installation Details (button on the bottom left)
in the new window you can remove software, or revert some installation/configuration with with the "installation history" section.
Hope this help you
Aptana has started crashing - possibly due to Python or Git