There are only two possibilities that could cause that problem. The first possibility is running a cracked version of the game. Doing so will cause you grief with many of the mods on this site that need the legal Steam version. Specifically, the mission replay mod touches on the interface and gui with its additions and would cause those kind of freezing issues in menus. Since this is not the case, the second possibility is that you have installed some other mod(s) and forgot you did so. What you should do at this point is the following: 1. Delete all files from the root of your SRTT install with the following extensions: *.xtbl *.lua *.str2_pc *.asm_pc You may want to sort by extension to make sure that you get rid of them all. 2. Verify integrity on Steam so that any modified original files get reverted back to vanilla. Now that you are back to a fresh install, test the game and see if the menus are working correctly. If so, reinstall the replay mod and test again.