Daan,
>> So, if I understand correctly, when you open the section Galleries in the tree, you still see your galleries but they're all empty?
correct
>> Galleries are made up of simple pointers to thumbnails (thumbnail records) elsewhere in the database. Could it be that the original thumbnails to which the gallery entries referred are no longer there, or have been replaced by new thumbnails?
they are certainly there, although yeah, I think perhaps new thumbnails. why would new thumbnails matter??
thank you Daan. you are always a great help!
David