Project View Won't Show Directory

I have some directories of data files containing telescope component information. The NICMOS directory has three sub directories: 1, 2 and 3 but IDEA doesn't want to show those directories - and that makes it difficult to edit the files therein.

Is this a bug or am I doing something wrong here?

IDEA 5.1.2, build 4267, MacOS 10.4.6

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