Yet another Copy and paste answer that doesn't address anything said Emmanuel, if it's this wide spread its obviously not a case people are not logged in and if we were not logged in how could we even see any of the points stuff being it does not show that but a banner encouraging people to sign up, yet a simple bing search will give a person a good reason not to within the first result.
As to 'resources' on the Bing side it's becoming more clear they do not given they aren't answering people or answering in an accusational way, the problem is not user end, it's whichever fool implemented a change that removed the puzzle function and then when back pedaled caused an issue with points registry along with not fixing the issue.
While I appreciate it's a free service nothing irritates me more support wise than vague or bad answers, I used to work on that side and stuff like this would be a trip to the Managers office for a good long chat.