Mounse pointer disappears over Cubase real estate

This issue may be related to https://www.steinberg.net/forums/viewtopic.php?f=283&t=169792 , but mine is more general. Every once in a while (about once every 4 sessions) my mouse pointer disappears. I can see Cubase still knows where it is b/c if I happen to hover over (say) the Exit button it colors red. But I have no way of knowing where I am. I have to close Cubase and start again

Cubase 10.5.20
Windows 10 Pro
Intel I7

Is this related to using the notepad in the track inspector in project window?

No, it really happens Cubase-wide. The mouse pointer disappears and all I can do is close Cubase using keyboard shortcurts.

I thought it was just me… this is happening especially after the latest C10.5 update.