The fix I suggested for this resolved CLIM Listener bug:

Package lock errors when compiling/loading with CMUCL 19 or later http://mcclim.cliki.net/Bug#listener-cmucl-package-lock

was shortsighted. I conditionalized package locking on feature cmu19a:

#+cmu19a (progn (setf (ext:package-definition-lock (find-package "DEBUG")) nil) (setf (ext:package-definition-lock (find-package "COMMON-LISP")) nil) (setf (ext:package-definition-lock (find-package "EXT")) nil))

But compilation and loading of the Listener fail again with CMUCL Snapshot (19B) 2005-06, which is the first in the 19b series. A short term fix may be to conditionalize on just cmu19.

Paolo