I recently decided to fire this up again, playing TFTD. I hadn't installed the most recent Nightly in several months. After launching, it tells me it can't load TFTD, says there's something wrong with "standard\xcom2/vars.rul" and that it has more details in a log file. Log file just says the same exact thing, no further details.
So I installed the latest (08/03/19) Nightly. Game ran just fine, played for hours. However, just now I tried launching it again and got the same exact error message. So I reinstalled the Nightly, and it worked just fine. Rebooted my machine, launched the game again...and got the same error. So basically at this point I have to reinstall the Nightly EVERY TIME I want to play!
I'm not using any mods on TFTD other than the ones built in. What's going on, and how do I fix this? I really don't care if I lose my save, I just want this FIXED.