[bug] A lot of errors while clicking buttons / Invisible buttons

First of all, i tried to reinstall the games 2 times so that won’t help. Now to the problem. When i start the game it acts just as it should, but when i try to verify things like clicking ANY buttons (ex. after writing my company name and name) errors like “Uncaught TypeError: Cannot read property ‘isCustom’ of null”. Sometimes other things than “isCustom”.
On top of that alot of buttons go invisible but when i hover the mouse over the place where the button should be i can see how my mouse icon changes and shows that i can click on the place, but nothing happens.
I have 2 mods installed: Info stats mod and expansion pack (the game can’t pick it up though)
and ultimate lib.

I would really appreciate any help i can get!
Sorry if my text is confusing, english isn’t my first language.

I moved 3 posts to an existing topic: Official Mod Code Error Thread - For Mod Users