You should note that custom maps can have issues like this when custom maps have other maps connected to it. I would suggest re-installing the map, or asking the creator to provide you with a .fhm of the map you're trying to get into so you can enter it directly from Cape of Distant Worlds. Sometimes it's a good idea if custom map makers (who have created maps with other maps connected to it) update their maps every once in a while, to prevent this. It's like this, in recent events, people weren't able to enter Cherika Valley or Eastern Pass because they were bugging out and no one could connect to or enter those two particular maps. So, Raz had to do a server restart to resolve this issue, and this has happened in the past. Not with the same maps, but you understand I'm sure. I hope this provides better reasoning to what may be going on, and I hope my suggestions do you well.