fantasy grounds 2 players can't join campaign

I'm not having the stereotypical problem where a bunch of PCs meet for the first time and are automatically so paranoid of strangers that they start trying to kill each other. I absolutely want to avoid asking my players to just solve this through metagaming ('Hey Joe, think of a way to get together with those I can't story-tell two separate groups at the same time!'). How can the GM get players, with diverse characters who are strangers to each other, decide to have their PCs act as a coherent group? Fantasy is all about diversity – you do not character-generate a strong man with a sword no, you generate a half-ogre with an axe never before seen! Furthermore, people generally like others with the same behaviour/interests/skin colour. It is not easy, as trusting someone with your life (what happens during combat) is not a trivial thing. However, I am now experimenting with giving the players complete freedom at character creation and later meeting in-game. This has the added advantage of cross-backstories – as the players try to adjust their stories to fit together, they get and create hooks for more narrative! One simple and really great solution is to require the players to design their characters so that they know each other. The problem is how the GM can ensure such a relationship between the characters. This way the GM has to manage one environment – not, say, five.

I believe that it is generally a good thing that all the PCs travel together, as a 'party'.

Fantasy grounds 2 players can't join campaign