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Steam:
76561197968459473 Steam join date: Aug 23, 2004
Steam Level: 56
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It is indeed a problem with Linux. Linux and/or the engine doesn't like the fact that the model directory has upper case characters. I know Linux is case sensitive in regards to files, but the code refers to them by the correct case. I think somewhere in the engine, it is getting converted to lower case and thus the problem. The fix isn't as simple as renaming the directories to all lower case.
I'll probably release an update later.