[Zope] Zope Database error

Hi all, I have recently upgraded to Zope 2.4.2. Installation was fine and so was adding the products. The problem occurred when viewing the database. The copy was OK but when viewing the CMF portals, the portal skins did not contain any basic data. The generic, no_css, images, content, control, nouvelle folders are all empty. When I create a new CMF portal they are as they should be. I have tried exporting and importing the required folders, but they same problem occurs but are present in the original database, my custom folders are also present and work fine. Any ideas? Thanks James