I've put up with this problem since I think the beginning. Occasionally Construct will just hand me an error message and screw up Construct when I try to open the expression editor in the event sheets. Now, I haven't been real angry at this until I switched from XP to Windows 7 where now I can't even click this error window away, save, and restart Construct to have it behave normally again.
So now I'm working with a ticking timebomb of frustration that will randomly have me lose progress. I really think it has to do with Construct evidently re-rendering all the sprite, etc. icons you can see in the expression window and event sheet window, because it always happens inbetween clearing those lists to redraw them again.
I specifically read someone saying they had no crashing issues with Construct in the latest version (0.99.84) so I switched to it, but no, the problem persists. Is there any way I can fix this, because I have no idea how I'll put up with it if I can't save...