Yeah, I gotta look more into it. If I can't figure out where I made a mistake or why it keeps crashing on resolution change, I might end up just removing the resolution options for a while (and just keep the fullscreen toggle), until I can get a better handle on it. We'll see.
The resolution list is all of the display modes that the game thinks your "primary" monitor supports. My guess is that if there's duplicates in the list, it might be because there are multiple color-depths or refresh rates available for the same resolution (and my list of buttons are just showing the resolution width and height). I'll add in the extra display mode info to the button list to see if that might be why.