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I have seen problems like this before. I believe it is caused by disagreements between ACL and the CLX back-end of McCLIM about what form of authentication to use against your X server.
Here's a suggestion: try pulling down the ACL mirror of portable CLX, from the Franz Open Source site, and use that instead of the CLX that shipped with ACL. That /may/ fix things --- I believe it supports more different flavors of authentication.
Another alternative is that this may involve Mac OS X's way of starting up X. I have a vague memory that it somehow opens a socket or specially named virtual file or something, and that by opening that socket the X11 server automagically starts. IIRC, that was also a place where I had to tweak my set up to get McCLIM to run.
I'm afraid this is all 2 years + old, so it's a bit vague. I haven't run McCLIM in quite a while now. Hope that helps.
r