Again, submitted via e-mail, posted here for anyone else interested:

The map completely erases all progress when you move from one area to another. This is good when moving to a new area, but not when moving from one known area to another. This is quickly seen going from Cavern-2 to Cavern-1 and back. Whatever you’ve explored should remain on the map.

Also, the feature showing red squares for enemies on the mini-map is very nice. Is it possible to show the same red squares on the larger map?  

I've had the same problem but it's intermittent.  Also, when the map gets 'reset' it also resets the encounters/monsters on that level.

As for showing monsters all over the large map, I disagree.  The small map shows them and it makes sense because an alert adventurer would know something was out there.  Showing them all over the large map would imply some kind of cliarvoyant powers ;)

EDIT: As of the recent update it's still doing it.  I had to kill the first boss twice just to get out of that level because it 'forgot' that I'd done it already, along with forgetting the map.  It happens when I save a game and reload usually.

EDITED EDIT: It just did it to me again.  I am on level 8 and I saved my game and quit.  When I restarted it the map was blank except for where I was standing and just around the entrance.  It also reset all the monster encounters.

I've found it always best to enter the next level prior to saving...

Chief

That's really not acceptable in a release version of a game.

No USB device connected in my case.  It isn't a total show stopper but it was a little annoying to have to redo levels.

The workaround is great for now, thanks.  Hope you get it fixed soon but for now this is perfectly acceptible.