HI LeonidS. Thanks for your message. It just didn't launch the studio. I dropped the DB and recreated it on MySQL root (it was under a different path before) and also reinstalled everything from the beginning and this time worked fine. In fact I'm currently finishing my 1st. prototype. 

BTW do you know some app or way to add additional related entities to Profiles: I need to crate a person-related skills table so every member has multiple skills associated to his/her profile and validated by other members. Any idea? (Sorry, I guess I should have posted this question separately, right?)