The "Waiting to Join" message issue if you like to call it that is something of a mystery.
I have seen it seemingly randomly pop up with me since early V1 Betas through to V1. Trying to track down the reason for it is not easy. There is much confusion in the Build dialogue box settings and how that and FPSC erratically behaves in its handling of dealing with sessions when working with many different files in one session, particularly when switching from SP to MP game levels. I can best describe the behaviour as unstable. The result is upredictable consequences.
Anyone having this problem have Teleporters in their levels?
I have the "Waiting to Join" message appear only if I use Teleporters - if I remove them the issue dissapears.
I dont think there is any relevance to Firewalls particularly as some may suggest - I believe that to be incorrect and that the error is an internal FPSC one which you cant overide as the error is internally in build to the game save .exe. As long as a Firewall is set to allow permissions it should have no bearing. In the case of the Teleporters above this is clearly the case.