I'm using the January 25th build with ykhwong's daum dosbox.

I can't get Jazz Jackrabbit to perform right under it, even though it runs fine under vanilla dosbox. Under ykhwong's daum dosbox dos box the sound is choppy in the intro movie, and the screen is stretched out regardless of what output I use, but I default to direct3d. Same goes with the scaler. No matter what scaler I use, the screen is messed up.

It only looks like that once I enter the game. It looks fine in the menu.

I attached a file as an example.