So I had issues with with the comments that started sometime after I posted last Sunday. Ruth let me know that she was unable to save comments (got a 404 error upon submital) and I confirmed from 2 different browsers than what she was using (Mozilla Firefox and IE). The funny thing was, in that time Cop Car was able to comment from IE. In four tries, I got a comment to go thru, but the next try did not work.
I contacted the Typepad team and they determined that at least part of the issue was the code in my very old templates. I had made these templates sometime in the early 2000's and haven't found a need to change. The team encouraged me to use one of their template builders so I wouldn't have to mess with any code. I followed their advice and the resulting look is from that endeavor. I was able to customize and specify content thru the builder very easily.
The change solved my issues with the 404 error with both Firefox and IE. Alas, Ruth had different difficulties with Chrome in that the "Post" button never became "Live" for her. So back to the Typepad team I went. Thru a series of trials from both the Typepad team (using Chrome) and Ruth, it was determined the most likely culprit was something unique to Ruth. She was a real trooper trying different ideas (most thought of by her), until finally she downloaded another Chrome-based browser that worked.
We still never figured out what was unique about Ruth's set up - which would have been nice in case it crops up for other people. But, hey, sometimes you just gotta say "Good enough is good enough." Thank you so much Ruth for being willing to try different things and report back results!
I would also like to thank the Typepad team, who was incredibly patient and went thru my original custom code and made suggestions for fixing it, or updating thru their builder, then made suggestions for testing the Chrome set up that started having other issues.