I was editing my map, I selected 5 brushes, some with and without editing. (Meaning some were triangular for ramps) I went into the texture selctor to change their texture, and when I selected the texture, MY ENTIRE EFFING MAP WAS GONE! NOTHING, NOT EVEN A CRASH, 0 PROPS 0 ENTITIES 0 BRUSHES! I saved hoping it was a crash as that what I would usually do, and immedietly closed hammer hoping to see the auto save file popup. I DID NOT, I reopened the map hoping nothing was wrong, and ITS A BLANK FILE NOW! How the f*** do I undo this. Sorry for the foul language, but this would piss of anyone.