I've been using Flash Builder and just the other day it stopped reporting errors in the problem panel for any projects until I try to run them.. saving is no longer enough. I know this isn't an issue of external files because I'm in class and my neighbours have the same code and it's updating the problems panel on save for them!
Anything I can try to get it back to normal short of reinstalling?
Can you check if "Build Automatically" is checked in the Project menu?
that looks like it fixed it. thank you!