You can no longer "drag & drop" files in certain applications such as "Entourage", "Adobe GoLive" or "Hotline". Your OS is either 9.1, 9.2.1 or whatever. You've tried all the carbonlibs you can get hold of and yet none of them can revive the "drag & drop" feature. Then try the following.

Remove "MacMP3 Extension" and/or "N2MP3(TM) Extension" from the extensions folder.

I found this tip in MacFixIt Forums at :

http://www.macfixitforums.com/php/showflat.php?Cat=&Board=OS92&Number=231573

and, hey, it worked for me. Boy, those people out there are smart!