Thank you for your answer, Scott. Lot appreciated ! I tried it but...
Nope, it doesn't work. I changed the flag from 4 to 2, then 1... The super admin Manitu can't signal a troll's post, or edit his own profile... It's still written "blocked" (in French). In the qa_options, my ip is not there, neither in the Q2A interface.
Concerning your questions, the guy just registered as a user. I banned his ip the first time. He came back, but this time blocked my Super admin...
I tried to import an older version of the database but it does'nt seem to do anything neither...
Damned trolls ! I hate those guys, make us loose so much time !!
Have another idea ?