So I imagine this will be hard to troubleshoot, but I'll give it a shot.
On 2 occasions now I was asked to join a game by a friend but I couldn't see his hosted game in the custom games screen, and in my aeolus window it didn't show him in a game or hosting one. I thought it was weird but a few weeks ago I had the same problem with the same friend.
This time they stopped hosting and joined someone elses game, but I couldn't see that game either. Turns out I was able to see 4 games, but he was able to see 10.
I don't know what could be causing this, so far I've restarted my system, and then I uninstalled and reinstalled the FAF client. I did not save any settings or data when I uninstalled.
I work long days so it'll be tomorrow night before I check back, but any help would be appreciated.