Does your feign death look like a purple leaf?
Then you probably made the same mistake I did -- you copied some UI files for a specific server without bothering to backup.
If you want to get the modern UI back, with spell gems that work, you can download this file and unzip it to your uifiles directory:
http://tinyurl.com/drakaa(Huge thanks to Drakana for uploading this!)
Here's a sample of what this UI looks like:
