Hi,
I've also just upgraded to C.S.S. 3.1.1. from C.S.S. 3.0.0. in my test platform, Splunk 6.2.3.
Had exactly the same issue as this so it looks like it could be a wider issue. I've just put 3.0.0. back on and it's working again. Might be worth rolling back until this issue is sorted.
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