BuddyPress Activity Plus - Non Admins Can't Post Videos...

Hi Support, I've just upgraded to the latest versions of Wordpress, BuddyPress and BuddyPress Activity Plus from their previous versions.

However, now members of my BuddyPress community can no longer post videos. Preview works fine, in that you can see the thumnail, but when you click on the 'Add Video' button in BuddyPress Activity Plus it doesn't post, nothing at all...

The weird thing is that 'Administrators' can still post videos just fine. I've tried disabling ALL plugins except BuddyPress and BuddyPress Activity Plus and also switching themes to Wordpress 2015, but it's still the same...

Please can you urgently advise? This all worked just fine before the upgrades...

Thanks
Rob.