[gnome] gnome shell - windowmanager seems not to run

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http://ubuntuforums.org – Hi folks, I am new to gnome(-shell). I am running oniric 64Bit and just tried gnome-shell, because I am not really satisfied with unity. So I installed gnome-shell and some extentions. However after some days, it does not work properly anymore. I don´t have a frame-border and this whole expose-like function(left sidepane) is also gone - so I would say that maybe the windowmanager does not run anymore. Thus I also can not log off. Currently I am logging in from remote and terminate X ( so the network-manager is running... I am using WLAN). However the upper pane is also not working. I tried (Hardware)