Vision Easy Chart will not Poll

it was a basic test, no scripts, 1 expression, and a single tag. The first test the only thing that was not default was Chart Mode.

pens:
image

For the second test all i changed was the end date:

I confess that I don't use the easy chart very much, but how many tags are you talking about? if its not a huge number could you just add all your pens, then selectively enable/disable and hide/unhide with a script? This post may help with the disable and hide approach.