Variable Boolean tile stuck on "Sending..." in Dashboard

During testing, I ran into another bug-a-boo. Upon noticing one of the Variable Boolean-type tiles saying "Unknown" (instead of "True" or "False"), i clicked it. Up came an empty checkbox and a SAVE button. I clicked the checkbox (so it became checked) and clicked SAVE.

But then the tile reads "Sending..." (here's the screenshot) and seems stuck at that. Any clues here as to what's going on?

Chrome (latest) in Win10 (latest). Expecting "True"/"False" drop-down picker.

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