I'm guessing your on iOS platform? Each day you should do a hard reboot of the device and it should work much better.Actually, the videos seem to fail more often than they work. Either it goes to a black screen for a while and then comes back and says the offer is not available, or it goes to a black screen and stays there until I force quit the game. I don't think I've had a video actually play and give a prize for over a day now. The worst is when it plays through the entire ad and then crashes right at the end without returning to the game
The second issue wher it finishes but doesn't return to the game, tap the home button to briefly leave the game and then come straight back in. Has about a 60-70% success rate for me and it's the sign to reboot again