Thats no wonder! You resolution isnt supported by OpenMenu and you have to pink one of those in the menu!
Thats my fault because i did such a bad design, that isnt scaleable... Im sorry for that!
So pick a resolution from the settings in the menu, then try it again and it should work!
Resolutions are: 800x600,1024x768,1280x720...
gl_mode 15 isnt supported...
Please note that you shouldnt use the statusbar in windowedmode! If you resize the window you maybe not be able to see the bar! Its fix to the resolutionsetting!