Admin Toolbar Missing After 6.1.1 upgrade

My client decided to upgrade to 6.1.1 herself (!!)

Now she tells me that she cannot see the admin toolbar when on the home page of her site.

I’ve logged in myself and neither could I – nor can I see it on most other pages (suggesting that the odd page I can see it on hasn’t refreshed since the update).

I cleared the site cache and reloaded the page and the admin bar reappeared so asked my client to check from her end.

The admin bar reappeared temporarily but then vanished again when she moved to a different page and came back to the homepage.

I am able to recreate the problem myself. I am definitely logged into the site as I have wp-admin open in other tabs. But the admin toolbar is not showing from the front end.

I’ve checked our user profiles etc and all is set to display the toolbar.

Is anyone else experiencing this since 6.1.1 and are there any clues as to what’s causing it?

Thanks