Using Spark 2.5.6 on Gnome on Fedora Core 6, 32-bit.
When I set my Gateways to “Sign in at login,” I have to “Exit” (because Linux version has yet to add “Log out” under “Spark”) then start Spark again to see my Gateway contacts and any separate folders in which they may reside (e.g., “Buddies”). The only Gateway contacts I notice are the ones who are in my “Offline Group.”
To avoid this annoyance, I have unselected “Sign in at login,” and manually sign in to the Gateways after I have started Spark. The Gateway contacts and folders appear as expected.