I had disabled RS Firewall and in global config changed editor to “none” - and still encountered the same problems. I have 2 other Helix Ultimate sites that work fine – but this is a new site just set up a week ago.
I think Helix Ultimate has been out for at least 3 years, so I'm surpised I'm having problems like this. Helix 3 always worked perfectly every time. It's also very odd that I have to download an extension from another developer to bypass a glitch in the Helix Ultimate code.
I see that I need to just stick with Helix 3 for now, and hopefully down the road all of these problems with Ultimate will be fixed.