Are you running your own server? minilogin?
If you are using your own server and minilogin make sure you get the new minilogin that works with 3.0 you can find this file at
www.shownomercy.net
Are you playing on other peoples servers?
EQ has recently had an update....I would repatch your everquest. don't forget to change eqhost.txt after the patch.
If that doesn't work.... I will need more info to help.