Lost Auto-numbering and Topic Properties Hangs in RH 2019 (Update 11)

[#1]

I just upgraded my RoboHelp Classic 2019 project to RH 2019, update 11. The upgrade went fine, but all of my topics lost their auto-numbered steps: 

When I click the Topic tab under Properties, RH hangs for several minutes before displaying the Topic Properties:

Once I'm able to double check that the correct CSS is applied (and it is), checking the autonumbering for the paragraph doesn't seem to reveal why all steps are listed as Step 1: 

Is there a fix for the slow response time for Topic Properties and my autonumbering? Thank you.

[#2]

I just upgraded my RoboHelp Classic 2019 project to RH 2019, update 11. The upgrade went fine, but all of my topics lost their auto-numbered steps: 

When I click the Topic tab under Properties, RH hangs for several minutes before displaying the Topic Properties:

Once I'm able to double check that the correct CSS is applied (and it is), checking the autonumbering for the paragraph doesn't seem to reveal why all steps are listed as Step 1: 

Is there a fix for the slow response time for Topic Properties and my autonumbering? Thank you.

[#3]

Isn't it because there's nothing in the "Start From" field?

[#4]

When I try to enter something there, it flashes there briefly and then disappears. 

[#5]

I am not surprised as the HTML / CSS3 code behind 2019 New UI is fully compliant with those standards and I suspect before it was based on older rules. Assuming I am correct on that, then Autonumber works in a very different way. I have described it in Item 49 in Snippets on my site. http://www.grainge.org/pages/snippets/snippets.htm#miscellaneous

There is also a demo project to download so that you can see it working.

Please don't shoot the messenger.

I don't know why you are seeing slow performance as that hasn't really been an issue. Try one of the supplied sample projects to compare it with your project.

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www.grainge.org

[#6]

Busted link there Peter - it tries to hit http://www.grainge.org/demos/autonumber/d

[#7]

Thank you, Peter. I am not having trouble with your sample projects. The Topic Properties appears just fine (no hang time) although the Start From field in your autonum-headings.css file is also blank (at least for me):

I just tried making a superficial change to my own CSS, reverting it, and saving it. That seems to have gotten my auto-numbering working again. I have no idea why. 

The Topic Properties is still slow though. I have upgraded before and never had this problem.

[#8]

One other note, switching between General and Styles works just fine. It's only clicking Topic that generates the hang time.