BuddyPress.org

Hi,
I am running the latest version of both WordPress and buddy press and i keep my plugings up to date.
I run a school site which is an https address.
In the last few days when i try to login in at school i am getting this message from my host host papa.
I can access my site ‘www.greatooaksschoolgo.co.uk’ but when i try to login the message is generated. In other words this appears to be a conflict between buddy press and https? Can anyone shed some light? I wonder if its a plugin change in which case i could unplug them one by one to see where it happened?
The site runs fine from home.

Thanks