Hello again; there was indeed a bug in CC that made it not remove grouping options for empty custom columns. I've just fixed that. I'll see if I can do something about the hierarchical columns not working tomorrow; it looks like 95% of the code is there to make them work, but evidently whoever wrote that part forgot to finish it! If I can't get it working tomorrow, I'll still publish the bug fix above rather than waiting until both are ready.
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