I have added WP 2.0.x support for the PayPal QuickTag.
Go to this link and copy/paste all code to replace the code in your quicktags.js.
IMPORTANT: Make sure you backup your old quicktags.js so you don't loose anything.
ALSO IMPORTANT: If you have customized QTs you will also need to move them into the new file.
FYI: Clear your browser CACHE after replacing the file.
-Ken Villines