Are you viewing it in the editor or on a server?
If the latter,
- is the GMAP file defined by folder config as both a file and a level?
- What do you see when you do "/find mymap.gmap"?
- Is it in gmaps= in the server config?
- In RC's playerlist, do the players show as on the GMAP (mymap.gmap) or on a level (mymap_00-00.nw)?