Test's won't compile

I'm using IDEA 10.0.2 CE, on a very large project. Things were working, but yesterday afternoon a problem came up where the unit tests would indicate that they couldn't find any symbols defined in the same module's source directory. I checked the build output directories and there are no .class files being generated when I do a "Rebuild Project". The project has some 49 different modules. Some of the modules have special needs, such as generating code via antlr.  I don't even know where to start here. I've cleared out the ~/Library/Caches/Intellij...Whatever directory (I'm on Mac). There must be some verbose log information I could dig into?

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