The Incredible Vanishing Level

A couple of times now I have been working on a level, minimized the editor or put it in the background for a while, come back to it and see that EVERYTHING has disappeared. No worries though because I compulsively save my levels probably a dozen times for every little change I make, so I didn't actually lose anything, but I am curious if anyone else has seen this happen or knows why it would.

Have you check the coordinates bar at the bottom? Is there a chance that the editor were responding to the arrow keys even on the background?

Hmm. That is a possibility. I will have to experiment.

EDIT: That doesn't seem to be it. Unless it happens while I'm playing a fullscreen game... which I do not have any of at the moment since I had to wipe my hard drive.

I do remember something like that happened when I was making levels. I let the editor open and did something else and going back it was on another screen. I don't know what is causing this but resolved it by expanding the map and looking around in the map.

A new development. As I said I had to wipe my hard drive recently. I made sure to make a backup of my level. I did not, however, make sure that it actually backed up properly and I have just discovered that the folder is empty. I don't know if these two problems are related.

Can it be that somehow you have tried to make a new level with the same name?

Nope, that's not it.

Have you check the coordinates bar at the bottom? Is there a chance that the editor were responding to the arrow keys even on the background?

That is my guess, it does work game-wise, and it has happened several times.
A little searching in either direction and I'm back