I doubt it has anything to do with the type of chart, but instead perhaps with the binding settings & some sort of issue with the data. In particular, take a look and see if the binding on “data” is set to a sample size of “Natural”. If so, when you look at the console in the gateway, do you see any messages like “No scan class information found for tags”?
If it’s not “natural”, let me know. Otherwise I would recommend trying either on-change or fixed. Ultimately, it’s trying to figure out what the tag’s scan class was running at, and is failing for some reason. If you want, you can call in and we can try to track down what’s really going on, but trying one of the other modes should at least work around it for now.
Regards,