The Blockchain Bookmaker project Wagerr went down -20% today with higher then usual volume. I have been reading on bitcointalk and this seems to be the story about the drop.
Wagerr offered bets on the Mayweather fight but they had not been paid out yet. A message was send from the Wagerr Team:
"The auxiliary developer on the Mayweather-McGregor promo has taken over payouts after the primary dev was forced to evacuate Houston due to the flooding. We've had some communication and coordination problems as a result, unfortunately. They are on track to run in 12-24 hours"
The payouts to the winners were done manually but 2 - 2,5% of the bet winners got more coins back than they should. Rumour goes that somebody got 1 Million coins back. So the price dropped hard but is recovering right now. The devs are buying back the coins and currently prepare an announcement.
There is a lot of pressure for the devs to show anything which might be the reason they held the maywearther betting promo stunt. There allready was quite some doubt about the development team and many people seem to be opting out which is why the price is down today.