Has anyone played this port of Duke3D? I'm experiencing a texture problem after entering a secret area in E4L1. You can enter the secret area from the vent here:

After going all the way inside the trolley tunnel, most textures will by replaced by their upper parts only and will remain after finishing the level. The only way around is to save, quit and run it again. Has anyone experienced this as well? This bug is unique to the Mac port.