I think most agree that it would've been nice had an ad-free version been rolled out quite a while ago. However, as you've now discovered, a quick, polite post here, indicating that ads have returned for your account, usually solves the problem, as IB has been very willing to, at no cost, extend ad-free browsing for those who had a subscription.

While it's not been handled wonderfully, and many of us would be happy to pay for this ad-free browsing, IB has decided not to deal with that right now, and simply gives it to those who previously had it, at no cost.