Thanks. I'll have to study that. I never modify those options ("user tag list" and "tags for this thread"). So it is unclear why I get an error only sometimes.
I'm not aware of doing anything differently, other than occassionally adding more than one table. But IIRC, I get the "tags exceeded" error sometimes when I add just one table.
Typically, when I add a table, I also add code-tagged text, which I use to list the formulas. And typically, I "reply with quote", creating a user or thread tag (?). Arguably, that's 3 tags; and when I click "add/edit tags", it says I can add 2 tags "to this thread". Not sure if that means 2 additional tags or 2 tags totals.
Anyway, my point is: since I don't do anything differently (IIRC; TBD), I don't understand why I get the error only sometimes. The operative word is "differently". I'll experiment to see if that's really correct.
Thanks for your thoughts. Glad that you solved your problem.