Unfortunatly, that`s not more working as I posted before:
Manually "Create Index Thumb" on Showphoto does also not work in any Category !
The Function seems to work, I`m getting a Message "Index Thumb build", but in the Gallery-Index changes nothing
Of course I deleted Browser-Cache, reloaded the Site and so on...
As a last Idea before I get Nuts, I will try to upload a new Photo into Categories and delete it again. In the Past that solved this "Thumb-Problem" which I had now a few times.
Altought I would be glad about an Answer to my Database Question !