Well.. I couldn't get to BGU either through Tapatalk. I had a look through their web site for issues and it seems they have made some changes.
1. Their search criteria hs changed & it seems people are not finding their forums anymore
2. Forum owners have to install a plugin to their boards to enable their members to use Tapatalk.
YaBB is not now on their Plugins list! [not that I would have bothered Griff to ask for the plugin anyway]
So all in all I'm sorry to say my recommendation is now not a solution at all
Sorry about that Mike and any other member that installed it after reading my post!