Haliken

Copying the Default folder was required in the very first weeks of the new UI during the mid Luclin era. Originally, it didn't pull missing files from the Default folder automatically so everything had to be in your custom folder. It wasn't long until this was changed but the damage was done and over the years people have still made copies of the Default folder.

Copying the Default folder
Pros:
- If there's a patch that modifies the UI, but doesn't completely break the UI and the new UI files / changes would break your UI, having a self-contained UI folder could let you still log in.

Cons:
- You have outdated and basically unmodified files that you have to recopy whenever there's a patch (to the UI).
- You can potentially lose track of which files you have custom mods for.
- Wastes space needlessly.

Basically, the pro only works for UIs that are both poorly prepared for changes to the UI and lucky enough to not totally be broken by said changes.

The first con is the main one. Stop copying your Default folder. Make a new, empty folder, and put your UI mod(s) in it. If you want the Default UI's mouse cursors, copy the *.cur files from your Default folder. They're not technically part of the UI system and are loaded in a different manner than the UI.

Enok