hi,
there is no error message shown. i can see the map of the host, but we can not join. if we doubleclick on it or press the join button simply nothing happens. This problem happens with all maps we have (ef standard maps too). We have exactly all the same versions and the same maps (We can play maps in tov without problems)
The hosted game in the lobby is shown in grey (it does look like in coh, when you have incompatible versions - but without error message)
we did already reinstalled tov, patches and ef mod and copied the same maps. Everyone has an own key for tov. We also testet different pc as hosts without success.