We released an update (0.9.2.3) which contains a temporary fix for the server list. Servers will now show up in the server list, but the IP which is shown in the Steam server browser (not in the game) might be wrong. But the IP which is shown in the ingame server browser should be correct (and connecting from the ingame list should also work). It might take some time until the issue is finally sorted out, we need to get in touch with some hosters about that, but this should serve as a workaround
Since this last update, my server don't show up in server list and appear «not responding» in steam server list (I have it in favorites). I can connect by IP with no problem. before that update, server was visible on both
(self hosted server. Debian Jessie 64bits)