It could be your graphics card drivers. You might try updating. Then again I've heard of people having crashing problems after they update their drivers that have been resolved when rolling back to a previous version. Yeah, helpful I know. "Well it could be this, or the total opposite!"
Anyway I saw you tweeted that you can't recreate the crash any more... it might have just been some other program that wasn't playing nice v<img src="http://www.scirra.com/forum/images/smilies/icon_confused.gif">v. Hard to say. I guess just keep an eye on things in case it happens again.