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I hope this helps others, but I had the same situation and this following two steps resolved it (I think someone else mentioned it in this thread too but in passing and so readers might have missed it). I too got the dreaded no ads all of a sudden. Annoying so much that many levels were practically now cut down in moves to accommodate the extra 5 moves and extra few boosters that usually get with the ads before and after a level. I tried a couple of things including reseing my Google ad id and closing my Ad Guard. The following though did the trick and the ads immediately came back:
1- Log out of Candy Crush (don't worry, you won't lose your boosters as long as you don't delete the app or data). You need to go to the gear icon and click on your account name, select Log Out.
2- Afterwards, close Candy Crush (make sure you proper close it by swiping up or choosing choose all from the list of open apps). Then long-press your candy crush app icon and select Info or App Info, go to "Storage", and then clear the cache and ONLY the cache. If you Clear the data, you lose your boosters.
3- restart your phone for good measure but not necessary, you can now restart candy crush and let it start with no account at level 1, sign into your account from new with your email and password to go back to your level that your were at, and that's it. For me that restored the ads as they started offering me 3 ads at the end of the next level I played to get those 5 extra moves, free booster for an ad at the beginning of the next one, and a video ad balloon. I hope it works for you.
Just so everyone knows. If you make a purchase of any amount you will never see ads for lives or boosters again. You will no longer be in the “test group” because you are now known to be a person who will pay. Pay once…pay forever. That is how it works. And don’t think that if you stop playing for a while you will have the ad feature restored. You won’t. I am telling you from my personal experience. I am at level 12037 and I learned the hard way. Now I will just play until I run out of boosters. I have probably spent about $50 in the last 6 months and I am done. I am ashamed of my weakness. It is not the games fault. Their job is to make money. We are the addicts.