Screen freezes until menu clicked

In Premiere Pro CC Version 13.0.3, virtually any interaction with the UI is not reflected in the display until I click on a menu. For example, if I move the transport head, the transport head is moved, but the display remains unchanged until I click on any menu, at which point the screen updates. If I change a LUT, the Lumetri Scope and main playback panels will update, but the Lumetri Color pane (and the pulldown from which I've just selected the new LUT) will not change until I click on any menu, at which point the screen updates. When changing any parameter in the Color pane, the change is made, but the slider does not appear to move until I click on any menu, at which point the screen updates. Obviously, Premiere is unusable in this condition.

Using Windows 10. Problem exists even when I change GPUs, and with hardware or software rendering. Problem is very recent, i.e. within the last week or two.