I had this problem on and off for months.  Usually when I tried to re-open a saved scene, but sometimes when loading a character in a new scene (nothing else loaded).  Once these crashes started, I'd frequently have 5 or six in a row, and couldn't for the life of me figure out what I did to stop them.

I read in another post that someone had luck with clearing the cache.  Hit control K to open general preferences, hit the "clear cache now" button - answer OK, then load your scene again or start your new scene.

I now clear the cache every time I start, and haven't had the "pop back to windows" crash since.

It appears that there can be a conflict with the cache from a prior session, and everything dumps.  Interestingly, this even happens when I start back to the saved version of the last thing I was working on - one would assume the "undo/redo" files for the current scene would not conflict - but they do!

I also reduced the number of "Undo/Redo" from 100 to 10 levels ( I typically don't need to go back more than one step, so 10 is overkill for me ).

Hope this helps.

Lotus 123 ~ S-Render ~ OS/2 WARP ~ IBM 8088 / 4.77 Mhz ~ Hercules Ultima graphics, Hitachi 10 MB HDD, 64K RAM, 12 in diagonal CRT Monitor (16 colors / 60 Hz refresh rate), 240 Watt PS, Dual 1.44 MB Floppies, 2 button mouse input device.  Beige horizontal case.  I don't display my unit.