Aiyiyi, that is a mean host of issues. Thanks for the report, and I’m sorry it’s having that many problems.
It’s odd that something change between the 1.1 and 1.2 builds — we didn’t upgrade the Godot nor make any engine-wide rendering changes which is usually what triggers widespread system incompatibilities like this. (the image you mentioned didn’t appear to make it into your post)
I would love to see some logs of the game to see if they have a hint of what might be going on. After running the game and seeing some issues, would you mind submitting some to either the google form or emailing them to me at olive@wick.works? You can find them in the logs/ folder in the user data directory.
Out of curiosity, how are you testing various versions of the game? Did you just have them saved? I’ve been wishing itch.io provided a way for people to download prev versions for a long time — have I just miss it?
Finally, to get a 100% clean install, you can delete the entire user data directory which it looks like you’re familiar with in the custom assets bug post. LT doesn’t store or change any files outside of that “LancerTactics” folder. Rerunning the game will cause it to regenerate that folder from scratch.