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.)
n order to then migrate your existing file content to blobs you can use the
migration interface provided at http://localhost:8080/plone/@@blob-migration,
where "plone" should be replaced with the id of your "Plone Site" object. The
page will show you the number of available ATFile instances and lets you
convert them to the provided blob content type by clicking a button.