last night i was coding and everything was dandy.

i have a flex project and an actionscript project.

now, a bunch of flex builder 3's functionality is gone. i haven't changed
anything!

first, i can't hit F3 to go to the definition of a method, even methods in the
same class i'm currently in!
second, in the 'problems' box, i get a line number and the project name,
that's it. when i click on the problem, it does
NOTHING, it used to take me right to the line of the error.
third, it no longer gives me hints as to methods in the classes i've written.
i used to hit the period to reference a method or whatever and it would give a
selection of what's in there, but not now..

what the heck is going on? does anybody know how to sync this back up again?

Did you try cleaning your project(s)?

Project> Clean ...see if that helps.

Restart FB also.

If it's still insane, you'll have to take it to a psychiatrist. ^_^

No really, if it is still insane and you're out of ideas, creating a new
workspace could do the trick too. Of course, this is a pain re-setting up all
your projects and preferences. FB is a modified Eclipse, which has occasional
mental instability problems and bugs, it's OSS afterall..