Hi Edi--
I don't have enough time to dig into this, so if nobody steps up to resolve the issues with OpenMCL, I'll remove OpenMCL support from Hunchentoot for now.
The nuclear option? I recall hunchentoot working on OpenMCL a few months ago -- I was using it for some development (deployment to be on FreeBSD/cmucl), without any problems. Then the Mac got sick for a while, and when I got it back, hunchentoot was broken.
The unfortunate upshot of this (for me, at least), is that hunchentoot will no longer be deployable on a free Mac lisp, as SBCL/Mac doesn't have threading, and CMUCL/Mac is missing the multiprocessing package.
I'll try it out on the version you suggested later on today -- I'm using Mac OS X 10.4, so perhaps that has something to do with it. Another possibility would be to ask Gary Byers on the OpenMCL mailing list -- I'll do that when I get a chance to look at the problem in more detail.
Thanks,
Tiarnán