I didn't make it!
I can get it compiled just fine but when I run the mod, I open the console and type "map mymap" and it proceeds to load the map but then automatically kicks me back to the main screen after everything loads. Now this is just the vanilla source code that I complie and just a basic map that I made with a info_player_start in it. This works fine for just a HL2 mod but not HL2MP. I have my console output if anyone wants to see it. There isn't anything too out of the ordinary though, I think... ;)
Do you get any errors in the console?