Seems these fine people (other then me) are trying to help you but I guess that's just my opinion.
So I'm going to start over and hold your hand while we go through this.
1. You said it is doing this with the default ui?
2. You said you have deleted you uisettings.ini file 10 times?
If you answer yes to Booth of the above questions do the following.
1. Delete every file that has _eq2_uisettings.ini in its file name from your everquest directory.
2. Delete eq2.ini
3. Delete eq2_default.ini
4. Delete eq2_recent.ini
Start EverQuest2 via the patcher. Once you are in game cast a maintained spell/skill. See if the maintain window shows up then. If not make sure the spell/skill is in effect, you can tell by the spell/skill being darkened.
If after all of that doesn't work, I don't know what to tell you, other then open up a CS ticket with SOE.
