The Dungeon Maker has a couple of bugs. Most significantly, it doesn't work correctly in two-drive mode, which is how I've set up Dungeon for use for playing so you don't have to swap disks so much.

For storing items, Dungeon uses the Commodore-specific REL file format, which is difficult to simulate without also simulating a Commodore disk drive. If it weren't for that, I'd put the Dungeon files in a local directory in the distribution to play from there. It's weird how 34-year-old design decisions can affect emulation now.

There is at least one other significant Maker bug that I don't know what triggers it, that can once in a while cause the infuriating DISK ERROR when its time to save your work. I'm not sure if it also happened on normal hardware.