Hello,

thank you very much. Although i thought i checked everything you gave a new direction. It seems that the problem doesn’t have to do anything with data tables. It’s rather a MySQL issue. I’m aware that SQL query mistakes lead to redirection errors when using data tables. However, as the queries have been working for years, i didn’t see the possibility that something could be wrong. As my queries are very complicated, I’ve to figure out, what the problem really is. I guess it’s an update issue of a newer MySQL version.

The issue is solved, it's no problem of data tables!

Thanks again!
Atexo