wondering what led to the problem for me, if I had deleted the product at /Control_Panel/Products/manage_main then restarted the ZEO cluster, might that have thrown a spanner in the works?
2008-09-23T10:35:03 <RobZoneNet> i believe that should be the desired action
Seems that it's OK to delete products in this way. (AFAIR it's sometimes necessary/recommended when the TTP view of available/installed products has gone awry. Following that, and a restart, both ZMI and TTP views of products should be fine.)