ST2 will become completely unresponsive when performing some searches. I can reproduce it consistently with a project containing Bash scripts. ST2 will likewise hang when reopening, requiring deletion of Session.sublime_session.
Grab this repo and open it in Sublime: github.com/sstephenson/rbenv
Do a "Find in Files", enter something that will hit many files, eg. "e". (Make sure "Show Context" and "Use Buffer" are enabled.)
ST2 will now hang indefinitely, and must be force-quit.
I did a sample of a hanging process here: dl.dropbox.com/u/12091499/Share ... e_hang.txt.