Co op and single player in same map without rename?
The Playground map, and thanks for the advice, i did ask 
NocturnalGhost wrote:
Isn't it just a case of having an info_player_start for sp, and a pair of info_coop_spawn for mp? I don't think the actual map name matters, other than to make it easier to know the map's intended use.
Actually, the name does matter. If you try to launch a map that starts with mp_coop_ in single player, it will say Your partner has disconnected, or something like that. If you launch a map that does not start with mp_coop_ in Co op, it will not work most of the time, however, if you change the name of a map that is ment for Co op (For an example mp_coop_lobby_2) and remove mp_coop_, it loads in singleplayer... I'm very confused..

I could be wrong, but it's something you could test for, if you haven't already.
i'm not at home right now but i will try it later.