Acidfree Mass Import doesn’t work after Drupal update from 5.14 to 6.9

Hi
I’ve recently updated my drupal installation from 5.14 to 6.9 and everything works fine (I use acidfree 6.x-1.x-dev). All existing albums are visible and all pictures too.

The only problem: I’m not able to upload pictures to existing or new albums. Neither mass-import nor upload from a single picture work.

I’ve updated everything as described in the readme file; the only thing that didn’t happen was this (or it was too fast for my eyes?):
6. Press the Update button and wait while the update script converts all the
images and videos to the new version.
-> So the update script didn’t convert anything as I could say, but there was no error message and the update process ended successfully, because every album was/is visible.

The problem is now: I’m not able (neither as admin nor as authorised user) upload any new picture in an existing or new album (create a new album works fine). If I click the mass-import tab as an authorised user with mass-import authorisation, I got the message “No node types available”.

If I try the mass-import (or single picture upload) as admin, I can select a picture, press the upload button and after a few seconds (after the upload is completed) the site jumps automatically to the main site (/) of my homepage and there is no new picture in the album!?!? There is also no error message on the page, neither in the drupal log files (if I add a new album, there is an entry in my log files as should be)!??

Please help me, I like Acidfree and hadn’t have any problems until now!!
Best regards,
Roland