gr4devel's post in bug SQL Manager PS 1.5 [resolved user error] was marked as the answer
Here I am!!!
I'm sorry for my incredible late response!
Anyway thank you very much for your support selectshop.at ! And obviously to you El Patron!!!
At the end the problem was right what you El Patron suggested! I was querying the wrong table so there's no strange behavior regarding the SQL Manager.
I'm really sorry for having raised so much rumor about the SQL Manager, I hope it will never happen again!
Btw thanks to everybody!