GMAP editing
 

A glitch has been discovered by Zippy (Jacob_Bald6225) in which you can add indoor levels to an overworld (or whatever gmap available) to bypass NPCs. It works using any of a servers gmap. If you simply save an non included level over the original filename, and proceed to enter that room, all NPCs vanish. However, while bringing up this glitch, I also pose a temporary fix. Simply use setshape for all NPCs from now on, and you will have no issues. Beware, though, of players sneaking through quests.

-EDIT:
basically, the NPCs scripts are inapplicable, so if a NOPK NPC is set up, you can PK. If weapons are disabled, they're still enabled. If your using an NPC to block things, they don't work unless setshape is active.

"To bypass NPCs"?

returning to the point, it's causing issues. Again, the fastest fix is the usage of setshape, yet something should be done.

Normally its downloading the gmap again if its not matching the server version

What if the player sets their own their own version read-only?