By which you mean uninstall and reinstall, checking drivers, etc, as per the trouble shooting FAQ? You on the unstable branch (18.104.22.168)?
Did you also try deleting all the contents of the "cache" folder? Also, how many snapshots do you have? (I'm not sure it's an issue now, but after a change to their format, a couple months back, it was taking a long time for the game to start while it processed all old snapshots.)
Well, I guess I was slightly off on that number. There was actually 1,425 of them in there. Now it will load to the main menu just fine, but will crash instantly if I click to load a save. Sorry for the late response, I've been very busy.
Kind of a step forwards then, I guess... So it crashes before even starting to load into the world itself? (That's new... There was a recent crash caused by having component dongles, at all, fixed now.)
suspect the ram contacts, then the ram then the video card ram/ video card.
this sound like one of the just before fail ram/ram contacts/video card contacts issues, try cleaning the contacts with a plastic eraser (and if you can get it a product called de-oxit pro (this seems to improve the contacts to better than new from my experience))
Thanks for the response @harpo99999 . That was my first thought as well, but I've checked every contact and corresponding runner (both ways) on PCIE and RAM slots and also Vdroop at load on charged runners and they are all good. Then broke out the FLIR to check for heat issues, but no problems there either. Also, the desktop is unaffected. Only "open" windows have the squares. Very strange.
I seem to have made a little bit of progress. I tried the oldest save I had (my very first TT campaign), and it worked perfectly. then exited back to main menu and tried an R&D save and it crashed again. I'm thinking maybe even though I'm running a fresh install, maybe there are old modded techs in some of those saves I forgot about. Maybe I should consult the Paw about the issue.