Every now and again, trying to do something in the Layout editor (move a sprite around, say) results only in the "camera" being dragged around the layout. I can't reproduce it deliberately, and it seems to fix itself after quitting and starting again, although not every time. Apologies if this is actually a feature, and there is a key toggle I've not noticed, but I can't find it if it is, or any reference online to it. This quirk also stops you creating new sprites etc. as that requires you to click somewhere on the layout; and of course, in this "mode" the only thing you can do is shift the viewpoint about by holding the LMB and moving the mouse. I haven't posted a cap file as this doesn't seem to be specific to a project, it just affects the interface for a bit and stops as mysteriously as it began,
I can confirm this. It is not reproducable, it happens randomly. Quitting and starting again doesn't seem to help so much, it seems more that the win-precaching affects this, because if you restart the pc it helps everytime.