I dont know if this is caused by OS, but it just happened recently and hasn't happened before, so it's likely.

I was able to use OS fine for a day, but today I had no text chat ingame. I ran the msi in the redist folder like you're supposed to, but now the game exceptions as the ingame F2 menu disappears after loading a map (when chat is meant to be shown). Removing OS doesn't fix this.