@mitchelh This is likely because you're hitting our character limit on saved queries (37k characters). If you're saving extremely large variables or many TSIDs, you might see this. We have added better error handling for this recently, so if you try to save now the failure would be more descriptive of the behavior.
We are looking to expand this limit - it's an improvement that's on our radar, but I'm unable to share more info on when it'll be available yet.
