If you hold down the Ctrl button and click on the "Req Sent..." box on the chart it attempts to reload the chart from scratch. I had the same problem today and the reload worked.
Early this morning one of eSignal's Network Operation Centers was affected by a power outage on the West coast. This has affected some clients attempting to connect to the eSignal data farm. eSignal is presently recovering from this power outage and should have all servers operational soon. If you experience difficulty connecting to the eSignal data farm it is most likely due to this power outage. We apologize for any inconvenience this may have caused.
That condo owner member boards have more foresight to keep ice machines working via generators during an outage than a company traders rely on for continuous, real-time data, isn't good news, for traders, or their business prospect, anyway.