If you are using the platform bittrex then you should have experienced that the charts doesn't seem to load.
Do not go into stress "mode" as this problem is being delt with at the moment by bittrex and will be fixed
Here is an link to a tweet from bittrex also stating they are working on the problem:
https://twitter.com/BittrexExchange/status/957793298197835776
- BittrexExchange