when I drag some tags from the available historical tags to the selected historical tags for a query data source, it makes the second row of a report (the one with the tag history) to disappear. then if I remove the tags from the data source the report works fine again. I have gone and looked at the settings for the problematic tags and the working tags side by side and they are configured the same way so I can't figure out what the issue is. Just wondering if someone has experienced this before or knows why it's doing this?
Hmmm. I've seen such issues, but can't see why it might be happening to you. 