Ok I moved my game back to the applications folder, and ui's still won't load. I'm guessing it's an unknown problem that will never be solved at this point, and no one knows what it is since they've never had any problems loading ui's it just works for them.
The most common mistake at this point for you is to assume that it's an unknown problem, when in truth there is more of a chance you're just doing something wrong. Not criticism, just a larger change at this point.
Try setting one of your other UI's as the default in the ini file, then when starting EQ see if the UI comes up, whether there are any error messages in game, and finally check your logs for other messages. You should also check the privileges for the UI folders, shouldn't be an issue but no one here knows how you've setup your machine. This isn't something that others have had issues with, so continue to find the differences between your setup and others and you'll most likely find the issue.