I've attempted to upgrade again to the latest PS. It looks like the issues we discussed last month are fixed (thank you), but there are some serious new breakages:
1. FLET and LABELS no longer accept &OPTIONAL, &REST, or &KEY arguments
2. MULTIPLE-VALUE-BIND doesn't work: in the JS for (PS (MULTIPLE-VALUE-BIND (A B) (BLAH) (+ A B))), the function BLAH doesn't appear.
I'll post if I notice anything else.