>I recently upgrade to VFP9 and sudenly some of my selects stop working as they were in VFP7. But only those which I have used group by clause. I can not get it to work. Did the sintaxe changed? I even tried the wizard to create it but got the same error.
>SQL: group by clause is missing or invalid.
>Anyone got this problem, too?

It's documented change in the SQL engine behavior. See Re: Change in SQL commands! Message #941774