I've flagged some posts and comments and nothing happened.
Edit 1. An update after correspondence with the The Stack Exchange Team about my flag-ban:
- As people thinks here (Permanent flag-ban without warning.) it seems that I've been banned from sending flags to moderators. Is there anything you can do in order to reset my flag weight?
Yes, you likely are flag-banned. You've had nearly as many flags declined as you accepted! Indeed, you seem to have gone out of your way to make a nuisance of yourself using the flag system, repeatedly flagging the same posts when you were unhappy with the outcome of your previous flag.
Convince the moderators on Math.SE that the site would benefit if they were able to see more flags from you, and I'll lift the ban. Otherwise, you'll just end up in the same situation again in a week.
-The Stack Exchange Team
- What do you mean by "Convince the moderators on Math.SE that the site would benefit if they were able to see more flags from you"? Are you expecting a request for lifting this flag-ban from one of the moderators?
The thing to do would be to edit your meta question to indicate that you understand you have been flag banned, and explain to the moderators how you'll make certain that your flags will be accurate and not simply noise in the future if the ban is lifted. If the moderators indicate agreement, we'll lift the ban.
That's the best we can offer you - there's no codified help once you reach the level that you have - the ban is not designed to be escaped as it's an absolute last resort.
Regards, Stack Exchange Team
After this I gave up. Let me say that never ever someone sent me a warning mentioning the possibility to be flag-banned if..., that's why I think this "absolute last resort" must be a joke.
Edit 2. A moderator told me once: If the questions are actually duplicates, the answers can be merged into one question. After this I've flagged many duplicates in order to be merged, but other moderators found this inappropriate and rejected my flags. At that moment I had no idea where to look to see what's going on with my flags. Furthermore, I had no idea that some amount of rejected flags leads to a permanent ban.
I can survive with or without this ban, but it's better to make it public in order to let other users to know the "subtleties" of the system.