I just discovered theres a bug in 0.72b1 which you can easily work around (I introduced it myself
If you're hosting and your PC is much faster then others then it can happen that you finished loading before the others even started loading. This will cause them to drop out, they won't be able to connect.
If you notice this happens, just try again but erase the pathing info for the map you're going to play (only host does this). This will make loading slower but things will work, and since you had a fast computer anyway it doesn't matter too much.
Tobi
