Hi Centaurus,
I've just had a look at this and the bug will be fixed in the next version of the program. It was caused by the contour and blend objects updating both views during dragging, which is not quite right (you can see it leaving bits behind in one of the views) and not how other objects behave. This unexpected behaviour was upsetting some of the other code.
BTW: There is a workaround for you until the fix is released - have a single view and use Ctrl+Mousewheel to quickly zoom in and out. I think this is what most people do when they want to look at a drawing in detail because it's extremely quick, natural and convenient. That's presumably why very few other people encountered the problem.
BTW2: If you do ever encounter this bug (the semi-hang where clicks are mostly ignored), pressing Escape should get you out of it.
Phil
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