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I think stephan88 is correct. I myself have never heard of the xoops_trusted_path until your post this morning. And I have used and upgraded with 2.0.13, on up to 2.0.16. I forget, are you actually using GI Joes fast cache or the Cube?
I don't use a couple of the modules you have listed. Maybe you could (if you haven't already) systematically deactivate or even un-install them one at a time to see if one of the modules is giving you problems.
Quest