Multiverse
Incompatible with MV-NetherPortals
Looks like we have an issue where servers using MV-NetherPortals and MV-SignPortals (a sign on a NetherPortal) produces undesirable results.
A user created a sign portal on a nether portal frame for world destination: fred As op, the user could use the portal and go to fred. Non-ops using the portal would be bounced back and get some error saying the destination doesn't exist.
I got him to get some debug output: http://pastebin.com/raw.php?i=viZ9MsXN
It appears that NetherPortals may be bouncing people back.
Turns out, giving the player access permission resolves the issue of not being able to use the portal. However, the text the players received was a bit misleading.