OK, so here's more info.
With the F12 debugger turned off, I have to do everything twice. In this post I typed the words "OK, so here's more info", Clicked "Post Reply", and then nothing happened. I opened Chrome's F12 debugger and saw in the Console this error:
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR /threads/having-to-do-everything-twice.3606933/add-reply
A quick Google search came to this:
https://usefulpcguide.com/18302/fix-err_spdy_protocol_error-google-chrome/
I am going to try the "
Flush SPDY Sockets in Google Chrome Browser" step and then will report back.