OK go to your options menu (alt+o since you cant get to your options thru the start menu) This is going to bind a key to open the Game Menu so you can see the options till a fix is found out or what is wrong in the UI.
1. Navigate to Controls > Expand the "Window Keys" Section > Scroll down to "Game Menu"
2. Since ESC is bound to cast cancel, etc... i did Shift+ESC since this is bound to nothing by default
I am still looking into what is wrong i am not a mod nor a Dev just a computer programmer that knows a bit about XML i will post and submit a fix if found. Hope this helps you guys till a Fix is found or made.