Hi Michael,
It just so happens we ran into an issue that exposed the root cause for this one as well. It's related to the fact that on Linux the file system is case sensitive and we, TM1, being a bit too eager in making things lower case. A fix is slated for a future TM1 11.8.x (PA 2.0.9.x+1), at the earliest 11.8.8 (PA 2.0.9.9) if it can get into that one in time.
In the meantime, as I kind of implied, a workaround could be to make sure the path to your data directory is all lower case, then you probably would no longer be running into this issue any longer either.
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Hubert Heijkers
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