Viewport doesn't respond to mouse clicks

Hello Peter,

So sometimes (very often) after some manipulation, like rotation of the bone, viewport becomes inactive for mouse clicks. I mean, I click the right button to rotate the camera, for example, and nothing happens. I click the middle mouse too, to pan the view, but it doesn't work as well.

I have to select the hand tool to pan the view, and after that it becomes responsive again.

Can you figure out what is the cause of such behaviour and how to fix it?