[gnome] cursor switching to crosshairs and stealing focus in gnome-shell

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http://ubuntuforums.org – hey all -- stupid question.... in gnome-shell certain commands (eg., switching workspaces by key combo) leave me with a crosshair-like mouse cursor rather than an arrow. once it's switched to this, i can't do anything until i click in order to get focus back to whatever i'm doing. it also seems to happen at random sometimes, or when alt-tabbing... i can't always reproduce it but it happens a LOT. this is not crosshairs like the accessibility ones for finding the cursor -- it's just that the cursor changes into a plus, like: anyone know how to fix this? it's super annoying... (Hardware)