though supermoderators and moderators are checked to be able to post products, and usergroup editor set to allow everything except "admin access",...
Admin group can do everything (all set to yes)
Admins are the only members that can post/upload a product.
usergroups are refreshed, running lates version of VB and latest of reviewpost, and included photopost too.
I don't know what's wrong...
My RP is VB3 integrated.
But I found what was wrong :
I set the right params in VB Usergroups rights, product categories, ...
but in options, I didn't understand I had to set to yes for "Allow users to upload products".
I didn't understand this parameter but now, much stronger than others.