This is not a super big deal but is annoying. When using a real time preview, I often get this message when I try to close it. Note that the "spinner" has stopped spinning as long as 10-20 seconds before I try to close the RTP but the program either is still processing or thinks it is (Note that the image results have displayed as finished as well).
Mostly I see this on MMT probably because it takes a while with 5-6 layers, even on a small
preview section of the image. Other processes do it too but are faster so less annoying.
Eventually it will close but it seems intuitive that it should close gracefully once the spinner tells the user it is "done".
