Finding that at the end of calculations AGi32 helpfully decides that I don't want to see the same thing on my screen that I was just looking at. Instead it knows that I must want to go and view an incredibly zoomed in section of the model space - so zoomed in that the cursor can't be seen to move even when the snap setting is set to 0.001m.
Doesn't happen on every project, but happens enough at the moment to be annoying.
A quick mouse-wheel turn zooms back to almost where I was.
Further clarifications - it appears to be connected with multiple views. If you just have one view, it seems to be ok.