I just want to point out that blizzard did not disable the Custom Interface during the latest patch. All Custom Interface will not work everytime there is a new patch. This is because in the Table of Contents (.toc) file of your AddOn specifies what WoW Build number it is compatable with. To view/change this build number just open the .toc file with notepad, But if this dosent work try an advanced text editor (Such as EditPlus2). Anyways, every addon that worked prior to this patch, will say:
## Interface: 4062
As the first line in the .toc file. "4062" is the build number. To make the addon compatible(sp?), simply change 4062 to 4114. Save and exit and open WoW. Enjoy!
Im positive this works for standalone addons, im not sure how addons like cosmos works, so if someone tests it out, let me no how it works.
Edit>> Grammar
Edit>> If this is confusing, look at this post
Edited, Wed Dec 8 00:23:29 2004 by Vicond.
Edited, Wed Dec 8 22:36:28 2004 by Vicond