Is there something wrong with the data from the Bittrex Exchange for the Clam/BTC pair. Other currency pairs seem to be working.
http://imgur.com/a/LUy0xSame here, but on all pairs.
Are you guys using the demo? If yes, does a restart fix it?

What you see you be caused by network problems, and could be temporary.
I'm using the demo version. I logged off last night and then logged in this morning and find there is only 1hour of data.