Document class not initializing

[Mavrisa]

I have never run into this problem before, and it is certainly a strange one... and freakin' frustrating as well.

I've been working on a project for a little while now, and only yesterday did it start acting up. I added a bunch of new classes, and then two new functions and a few variables in the document class and then tested it only to find that it didn't work. I put a trace statement at the very beginning of the class: nothing. I commented out the two functions: nothing. I commented out the variables, and this time it worked. So I uncommented the functions: stopped working.
I decided to check through the variables to see which ones would work, if any. One of them, a GTween instance, did work. This is in a custom classpath: com.gskinner.motion.GTween
I tried other variables: only a few of my custom classes work (also in the same com folder, but a different path obviously), a few classes from the bit101 path work, but not all of them.

The compiler doesn't throw any errors, and output doesn't show anything. It just comes up with my background and that's it.

Anyone else had this problem? I played around with things for an hour last night and eventually got frustrated and went to bed.
I can post code if anyone wants to check it out, but as far as I can tell, there doesn't seem to be anything out of the ordinary.

Edit: I neglected to mention that it wouldn't even work with some of the classes in the current directory. Some of them were fine. Now, however, it works with those classes that didn't before, but GTween is a problem instead... grrr...

Thanks,
Mavrisa