fatal error can't load .core for different runtime, sorry



I get the subject error after a recent package update.  I'm running
version 5.20 packaged for Fedora 12: maxima-5.20.1-3.fc12.i686 along
with sbcl-1.0.35-3.fc12.i686.

When I try:
[josh at host]$ maxima -q

I get:
fatal error encountered in SBCL pid 10287(tid 3084924608):
can't load .core for different runtime, sorry


Welcome to LDB, a low-level debugger for the Lisp runtime environment.
ldb>

I found this seemingly related message in the list archive,
  http://www.math.utexas.edu/pipermail/maxima/2008/009797.html
but didn't really see a solution in that thread.

What is causing this error?  What can I do to fix it?  Thanks.

-- 
Joshua Stults
Website: http://j-stults.blogspot.com