When I try to exit e1m4 through the cave leading to the secret level, the intermission screen comes up fine and the secret level begins to load. However, before, the first frame of the level is displayed, an illegal operation dialogue appears. Oddly enough, if you move that out of the way, then tap the X and then click "No" to the exit dialogue, a frame of the level will display. You can then move around and click the X/"No" to display the next frame.
Anyone else having this problem?
-OCA