Doug Salomon
Tonight I ran out of ads from the lottery game, and still had some coins pending from the last mystery box. I tried one of the other games. After completing a level, I was shown an ad (of course). After the ad, I got my last few coins
I'm still having trouble with the doubling of the mystery box coins but I found a workaround that seems to work ok.
Tap the box and watch the ad. When you tap on the X2 button, wait a few seconds. If the new ad does not start, go play the Lottery game. Play this until you have to watch an ad. Watch the ad and you'll get your doubled coins.
Go back to the mystery boxes and the next box. Etc...
Keep doing this whenever the second ad does not play.