[MAC] Connection to Communication Service was lost...
This issue can be solved by clean reinstall, please follow instruction below to do that:
Please remove the GALAXY Client app from the Applications directory.
Please also remove the contents of these directories:
You can open it using the ""Go to Folder"" command accessible with the Command+Shift+G key combination or selecting Go > Go to Folder from the Finder menu.
Now restart your Mac, download the current installer from:
and reinstall the GALAXY Client.
Don't forget to import your games back after following above, instruction how to that can be found here.
[MAC] "Too many user sessions running"
Don't worry, that doesn't mean your account has been compromised :)
This error message means that GOG GALAXY is already running on another account on your Mac.
Rebooting your Mac should make it go away.
Also you can try to shutdown all GOG GALAXY process:
> Press Command + Spacebar to open search bar.
> Type Activity Monitor and open it
> In new window find GALAXY, click on it and just click ""Quit Process""
Now you should be able to launch GALAXY Client without problem.