Ghost Player

I'm new to Doom wad editing. I made a wad with 1 map, inserted some guns, weapons, etc. My first problem appeared, when I started a new wad. It often happens, that the creatures ignore me (here is short video: http://www.youtube.com/watch?v=tCO2Zu4z81U&feature=youtu.be). I tried new wads- some work, some don't. I restarted Windows, reinstalled DoomBuilder, Zdoom, I tried Gzdoom and Skulltag too. But it won't stop. I didn't have those problems with the first wad.‏

Add another sector to your map.

It looks like you have the monster flagged as “friendly."