i had a look but cannot see anything obvious.
would you allow m to install duplicator on that site (https://wordpress.org/plugins/duplicator/)
and create and download a package so i can investigate here locally on my machine without having to touch your installation ?

it’s fine. i do not need any more/other access.
I know why it works in my install, but not in yours.
It’s a plugin issue. I just need to find a reasonably intelligent way to fix it.
I would hope to have this done later today.

So when a new version of the plugin appears in your dashboard, just update it.

There are also a couple of minor depracation notices when using WP 4.5 I want to fix at the same time

thanks (though not really a question of “luck” ;) )
anyway, it turns out it’s quite easy to fix.
there should be an update in the next couple of hours or so

PS: this might take a few minutes to show that an update is available

no problem.
thanks for flagging it and jumping through a few hoops to let me narrow down the problem