If you're using the Fedora Lisp Yum repository, you should be aware that there is a conflicting build of SBCL that has just become available in Fedora Extras. The SBCL in extras has a larger version number than the one in Fedora Lisp and may be installed in an upgrade or by accident. It appears that this version conflicts with the version of SLIME at Fedora Lisp and so you may find things that were previously working now broken.

To work around this, edit your /etc/yum.repos.d/fedora-extras.repo file and add a line reading exclude=sbcl in there. This will cause Yum to ignore the SBCL in Fedora Extras. You may also have to execute a yum remove sbcl followed by a yum install sbcl if your system is messed up.

I'll try to figure out how we can get this working together better in the future. The good news is, at least SBCL is getting into Fedora Extras.