All-
Just wanted to post again. I appreciate those of you (Kim-LarryPapp, and others?) who are actively working on this with Microsoft. This was driving me so crazy that I've gotten into the habit of just restarting when I go to be at night, then log back in the next morning each day. I used to not restart for weeks at a time, since I preferred to leave things open that I was working on.
Btw, I'm also a retired IT guy and have spend tons of my life troubleshooting things. Unfortunately, I've had my fair share of unsolved mysteries, so I'm not spending any more time working on this, and I can get that Microsoft is having a hard time finding the cause (if they're really actively working on it at all!). It hasn't happened to me again since I've started the nightly rebooting. But if I hit it again, I'm just going to save and close everything and restart. I refuse to get upset anymore or spend any time trying to get it working again! I'm doing a lot of website programming these days (for free - either myself, family, or nonprofits), copy/paste is frequent.
-Dan-