You may have 2 installations of eq2, search for everquest2.exe and see if you find more than 1.
If thats the case change the settings on the Options window to the right path.
Ive got this problem too, maps not showing in game when ive installed them. So i did a search for "everquest2.exe" on my hard disk and it didnt come up with anything.
There is a Everquest2.exe icon on my desktop but that has a path of
Even tho my game files are in "c:\games\Everquest 2", my exe file seems to be in "c:\program files\sony\everquest2", very odd. I changed it and the maps worked fine