Last night, I brought up the kitchen drawing and flipped between Model and Paper space without any "poofing".
This morning, I dug up my original post (in Problems), and saw that rendering also seemed to cause the "poofing". Suggested fixes included downloading a new driver (which I haven't done yet), and dialing back my accelerator card. I dialed the card back two clicks, loaded the kitchen drawing, and clicked Quality Render. After a few seconds, I got a message about TC encountering problems and needing to shut down. When I clicked No (send a report to Microsoft?), it poofed.
Probably a separate issue, but it sometimes takes TC a long time to load. I'm guessing it was at least two minutes for the kitchen drawing this morning.