Frozen Screen

Hello,

I was hoping to hop back into some endless space with the new dlc's. However I keep running into an issue where the game screen freezes whenever I click on the diplomacy screen. This will happen when I use the hot key aswell. What can I do to resolve this issue? Is this a know bug with a solution? Would it be a good idea to attempt to repair the game through steam or redownload endless space 2?