Some processes are now marked as "internal server" which means they respond to requests for work from other processes. The main effect of this is that if the only processes that are remain are "internal servers", nothing is going to happen, so LispWorks quits.
For more information see the function
mp:process-run-function
and the new functions
mp:process-internal-server-p
and
mp:any-other-non-internal-server-process-p
.
Note:
On Windows,
com:server-can-exit-p
tests for internal servers.
LispWorks Release Notes and Installation Guide - 23 Dec 2011