Do you have more than one monitor connected to the computer?It was already set to 60, which I assume is the default. Again, fullscreen works fine, windowed too and I can change it no issue. It's just the save screen that won't open.
Also, Run as administrator has worked for some save issues.
That's the only thing I can think of right now. I checked my notes for problems people have reported for this game, but I don't find anything about this exact issue.