I'm working with a system that has both DateTime and datetime modules. Python handles this on case insenstive OS like OSX by emulating case sensitivity in its import. Pyjs doesn't do this so it ends up compiling both to a single file and the app then timesout waiting for a module that never gets loaded.
I can't think of a good way to fix this other than to append a hash of the case sensitive name to the end of each compiled js file.