Sorry, I'm having this problem in CVS 20051205, too...
My Italian is not as good as it should be, but maybe
this is more or less the same.
SuSE 10.0
aMule CVS 20051205
wx CVS 20051205 and 20051124 (both tested)
GTK 2.8.3
GCC 4.0.2
CFLAGS="-O2 -g -march=i586 -mtune=i686 -fmessage-length=0 -D_FORTIFY_SOURCE=2"
CXXFLAGS="$CFLAGS"
EDIT: OK, I rebuilt yesterday's CVS in the same environment and don't have this problem with it. Looks like the problem returned between yesterday and today.