Problem with cursor in MIDI Edit

This is driving me crazy!!! All morning long Nuendo has been acting weird! It dropped the connection with my X-tra keys module. Then it just stopped working and blinked off of the screen! I re-opened to find it HAD saved the work I’d done and gave me an “-01” suffix. But when I went back into MIDI edit mode the lasso was gone and, sure it enough, that missing lasso symptom predicted the crash and it did!

Can anybody tell me what this about? I’m seeing lots of posts here in a very concentrated period of odd crashing and locking up issues. Has some company in the chain changed a driver or something that is now making all of the N6.5 DAWs go nuts?
What’s going on?!!?