For some reason the DOSBox scalers almost always give me a blank screen while in full screen mode (1920x1080) in OpenGL and OpenGLnb mode. The scalers that have been unsuccessful are HQ3X and SuperEagle. The DOS game is Hocus Pocus in 320x200 VGA mode, but every DOS game I've tried (Jazz Jackrabbit, One Must Fall 2097, etc) has this problem. The only scaler that works is "Advanced Upscaling with factor 3".

The scalers also don't work in Directdraw, surface and overlay modes either. In these modes, the screen is just super tiny in fullscreen mode and not upscaled.

Is there anyway to fix this? I'm using DOSBox 0.74