I installed gnome-shell because i never really liked unity even when it was in 10.10 as netbook-edition so i wanted the bottom taskbar because of the lack of an easy window switcher, so i instlaled tint2 but i didnt really like it because it was laggy and too small so i got the bottom taskbar extension to gnome-shell and enabled it with the gnome tweak tool, it is running and i can see the workspace switcher but no windows are there i have no idea what it could be