Here's your issue. Open the settings file in notepad and under the theme node, change the values of the def_ nodes from 1 to 0. Like def_gamescr etc. Windows adds one to the screen count, so screen 0 is actually screen 1, and your settings are looking for screen 2 even though you don't have one and it's crashing. I do the conversion in the gui, but don't fix them if that index doesn't exist when it runs. I'll fix that for the next release and do a screen count and change that value if the index doesn't exist automatically. I tried to post the changes but it seems the forum strips out the XML. I can post the new file for you after work if you'd rather.