I hope i get a fast answer, because this is very fustrating: I got a problem with Sandbox 3... when i save a map, i get a error message (Save failed). I have tried reinstalling the editor and downloading again the file, but i always get the same problem. As you can guess, i can't make a map to play it if i can't save it.

Thanks for the future answers, and escuse me for my bad english

same problem!