No$gba runs abnormally/looks abnormal?
Most likely this is due to no$gba.ini becoming corrupt. Delete it and allow no$gba to create a new one again and then setup your emulator as you want it again. This could also be caused by a skin which you apply to your system not responding well to no$gba, so try to disable the skin from being applied to no$gba or if need be your whole system. You could also try right-clicking on the no$gba.exe and clicking on properties in the appearing menu. Then click on the ‘Compatiblity’ tab in the window that popped up. Under ‘Display Options’ put a tick next to ‘Disable visual themes’, then click the ‘Apply’ and ‘Ok’ buttons.