For now, I can not find or reproduce your problem on SBCL 1.0.14. I take it you have removed your fasl files before re-compiling? To my
fyi, i've seen this myself, too with sbcl head on linux/x86 64. but it was coming and going, and i think it only happened when i changed some cl-postgres files which got recompiled in an image that already contained cl-postgres. but i can't reproduce it now, and i've not seen it for a while now.