That is surprising since just 2 days ago the compatibility of the plugin was updated to 3.7.1.
I have opened a ticket with Atlassian for the issue: https://ecosystem.atlassian.net/browse/UPM-4921
Sometimes these sorts of things are caused by the combined FishEye/Crucible deployment model.
Are you using a combined FishEye/Crucible, or just Crucible stand-alone?
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