We're sorting through some issues that may have been introduced with tag path manipulation, could you please go to Status>Logs in the gateway, click the gear "Log Config" button, look for "tags.history.query", and set it to Debug? Then go open the chart, and go back and look for the log message "Starting history query for...". Copy that and put it here, I'd like to see what the tag paths look like when they get to that point. We may have to go deeper, but that's a good starting point.