broken maxima: fatal error encountered in SBCL

[Hiisi]

Dear users!
Recently maxima/XMaxima/wxMaxima got broken on my machine with the
following message when started from terminal:
$ maxima
fatal error encountered in SBCL pid 15897(tid 3086857920):
can't load .core for different runtime, sorry


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

It worked just fine about a few days ago. Could anybody help me with
it? How do I fix it?
Now I'm stuck using maxima in windoze xp on VirtualBox and it's
terrible slow :- (
]$ rpm -qa | grep Maxima
wxMaxima-0.8.4-1.fc12.i686
[Sampo at imt ~]$ rpm -qa | grep axima
maxima-gui-5.20.1-3.fc12.i686
maxima-runtime-cmucl-5.20.1-3.fc12.i686
maxima-5.20.1-3.fc12.i686
maxima-src-5.20.1-3.fc12.i686
wxMaxima-0.8.4-1.fc12.i686
maxima-runtime-clisp-5.20.1-3.fc12.i686
maxima-runtime-sbcl-5.20.1-3.fc12.i686

]$ uname -r
2.6.32.11-99.fc12.i686

TIA
-- 
Hiisi.
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