This seems to have worked for me. So it could be a temporary solution for now. Friend list still doesn't seem to fully load though, I am not seeing all my Steam friends.

My friend list showed up the first time I did it, but has not done since.

I'm having issues to. All the integrations worked a few days ago when I sat this up (I believe it was Monday), but now every service is listed as offline. For the record it did take me 2-3 restarts of the client for it to see all my steam games, but the integration worked fine afterwards. Also unlike some of you I still see all my GOG titles just fine and can filter them based on which is installed or not. From third party launchers however the client appear to have forgot which games were installed. In my opinion this is a major design issue. The whole point of using GOG Galaxy as the one launcher to rule them all sort of falls apart if it doesn't even track the games you already have installed unless a third party API is working. Don't get me wrong I fully accept that it can't detect new games you have bought since it last checked in or see if a previously installed game is no uninstalled, but the 200+ games it knew I had installed via steam should still come up as installed until I eventually try and fire one up and the executable is gone. Otherwise the only real way to see what's there is to fire up the actual launcher from each provider anyway.