I have also seen the wait-cursor get "stuck". IIRC it was after I cancel out of some operation. I can't remember if it was only plugin's or when I had right-clicked on a file in the book browser. It did stay "stuck" until I restarted Sigil, then it was fine. It is definitely NOT something that would hold up a critical release - just an annoyance.
I'll try and get it to reoccur and post my steps.
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