Sometimes, when I compile a map--Hammer 3.5--, Hammer compiles ANOTHER map in it's place, with the name of the previously stated map!!
That is, when I go to playtest the newly-compiled map, it's some other map!
The only way I've found to stop this from happening once it occurs, is to delete whichever map is ACTUALLY being compiled, in the Valve Hammer Editormaps directory.
When this happened the first time, I thought it was just some weird filesystem anomaly, but it keeps happening every once in a while--2 or 4 times in a couple months.
Maybe it's a Hammer 3.5 bug, or something in my filesystem is b?rked. One thing I've noticed is the files it happens to have similar names, like the last one:
Map being compiled----example_twisted
Map actually compiled--example_model_shadows
Has this happened to anybody else?!