Yes, as of 10 days ago, the big B has banned many niches, such as diet, skin, make money, etc. BUT BUT BUT, the big B is NOT saying this officially. It is just like the big A has banned tech support in end of 2013, but does not say this officially. However a few people (like me) are able to get such ads running. Are interested in a "no upfront payment" trial with me
I guess you have been running your ad(s) before the recent B hammer : such ads from B accounts are not (yet) affected. What is your niche ? If it a big B sensitive niche and you run the same ad, same keywords, same LP from a new B account, it may get banned.