I'm no expert on this stuff so please bear with me...
I'm using the Domain Mapping plugin with varying degrees of success.
On my own Macbook I can see the site OK on Safari, but not on Chrome or Firefox. It also looks fine on my iPad and iPhone (both using my wi-fi and 4G)
A colleague in London can see it OK on Firefox and iPad & iPhone - he doesn't have any other browsers.
A colleague in Glasgow cannot see it on his iPad & iPhone and is only getting a blank page.
I then tried to map the domain to another site on my WPNetwork. On Chrome and Firfox I can generate a 404 page by going to a URL that doesn't exist, but getting a blank page on the root URL (home page). But I can see the site fine in Safari again.
Can anyone please advise if there's a browser issue here? or is there a propagation delay I'm experiencing? or something else?