Thanks for the quick reply, Ryan!
No, I did not install the 3.5 beta of Eclipse (or a beta of Core).
I am using Eclipse from a user that has write permissions, and I've installed other perspectives and software successfully from eclipse as that user.
The com.slickedit.linux.libs_3.5.0/slickedit directory isn't there, so I'm not quite sure why.
I have Slickedt 14 for Linux, and I got it to work on my Fedora 11 64-bit system by installing the libXt.i586 package.
So I'll use Slickedit to code, at least until a 64-bit Slickedit Core is released.
If I need to pursue this more, I'll post again.
Thanks!
-Scott