A few months ago I would get this problem quite frequently - then for some reason it seemed to stop. At that time I had two/three projects I would frequently switch between. I recently added another project and I make constant use of CTRL+ALT+P to switch between the projects. The problem is simply this: after I select the project to change to, ST2 crashes and closes instantly. When I re-open the editor, it is on the same project it was before (ie the project switch did not complete). I can then use CTRL+ALT+P again to switch projects without any problem - until some indefinite time in the future when it happens again.
I probably need to get some proper debug info. I use Ubuntu 11.10. If someone wants to tell me how I can get that info, I will happily post it.
Thanks for any help!
P.S. I love this editor a whole lot. I intend to pay for it - and this is currently the only problem I have and the only thing stopping me from doing so.