Right now, when you open a level and edit it, that's all good. But if you leave the editor and open up another map, all your edits will be saved to the filename of the first map you edited. It's really bad.
While I am aware of this bug, I have forgotten about it on a couple of occasions, and last night I had to remake an entire map from scratch because it was new and I hadn't put it on Pleiades yet. Thankfully I remembered pretty much every little bit of it, but really. This is a pretty bad bug, and I imagine it could severely dishearten some newbies.
Please fix this. Thank you.