Even after the bug fix update today still some ads not giving a reward. Just pop back into the game. Usually with a certain ad.
Continuing issue for me too. I was being patient and not complaining but now that some of the ads CAN'T BE SILENCED, I'm now pretty pissed off.
I started a new thread on this. http://forum.plunderpirates.com/index.php?threads/dear-in-game-advertisers-you-sound-awful.9558/