I have had issues with Easychart set up with database pens where I have the value of the tag as a readout next to the Easychart yet the chart continues to show the value of the pen incorrectly. It seemed that if a Tag was static the trend sometimes sat at the wrong value until a change come through. I have now found a similar problem as below:
Add generic device
Add history to Sine tags
Add Sine 5 to Easychart
Add calculated pen of “Average” of Sine5
All works fine for a few seconds and then average pen disappears.
Go into Customiser and back out and average re-appears
I’m hoping that an explanation of the above may help with the original problem when I get back to work on the original project.