For whatever reason, this is working now.
I know it makes no sense, but for grins, here’s what went on with this starting last week.
I added a signature and it did not display.
I created a test account as a basic member and added a signature for the test account and it displayed.
Changed the Admin account to a lower permission group and the signature displayed.
Changed it back and it went away.
Posted here about this and that top poster count in the other forum rather simultaneously. Played with that issue some leading us to this conversation and the signature shows up. Go figure.
Not sure why the error about the cache and I agree with you on that. I had already added the forum to the exclusion list so it was surprising to see that.
Thanks for your help