SBCL's 0.8.8 freeze is fast approaching, and Christophe Rhodes thinks he's got the SIGTRAP handler problem fixed (which manifests itself in hagning when using RUN-PROGRAM). I have put up a binary that has this fix in it; it would be lovely if people tested this and reported back whether it works or not. In particular we have had intermittent "illegal instruction" (SIGILL) problems and I would like to know if anyone can reproduce this on this binary - I can't.
On a side note, Clotho 0.2 is out. If you are interested in shaping what a native OS X Lisp IDE looks like, please join the project and produce MORE CODE!