Wasn't much help then...

I opened your testblog, and in wide view, for a fraction of a sec I spotted the menu title and hamburger flashing. But they were not to be seen in mobile view.
I made my version of that menu quite some time ago, still using RSD2.5, and after we had got SD3, I converted the menu I already had, so I actually didn't use SD3 to build it. I know they have changed the tutorial by adding a 'desktop title', wonder what else they have done...

I'll look further into it tomorrow, and then I'll be on to Bob...

I couldn't sleep. This menu was spinning my head, so I had to get up and switch on the computer again.
I banged together another such menu, to see if there was something funny in the code. I have done everything in the tutorial except that 'desktop title'. Ernie, and anyone else, could you please check if this one works for you? It does for me.

It seems to work fine for me at all viewports in Firefox, IE 11, Edge, Chrome and Opera.

Frank

Thanks, Frank, good to know. It remains to see if it will work for Ernie.

Well, I think I've found it. All I needed was some sleep.
Ernie, go to your sub-nav attributes and correct the spelling of the word 'accordion' (not 'accordian'). I've seen this word misspelled before, but I forgot to check the file of that other guy who had the same problem not long ago.
(and while you're at it, the menu item 'questionnaire', double nn.)

Inger,

That was the issue. I always thought accordion was spelled with an 'a'.
In the tutorial video the cursor is over that letter when she types it in and I didn't catch that.
I can't find the extra n in questionaire but I'll look again.

Thank you for all the help.

The correct spelling of the word 'questionnaire' is with double nn, that is what I mean.

Oh, my spelling needs a little work I guess.