Btw, did you turn on "Rapid Looping" in the ASI driver or CCD Simulator? It's under Options.
No I did not. I just tried it: when it is activated, in the sequence queue one single exposure is completed and then nothing more happens for both ASI and the CCD simulator. The spinning widget still turns, and I can abort the sequence, but that's it. The first time I tried it with the simulator the whole KStars crashed immediately when I started the sequence.