Something similar is happening to me with gnome-shell-3.10.1-2.fc20.x86_64 in Fedora 20. Sometimes however it is possible to drag windows to workspaces that have other windows on them already but I can't seem to ever drag a window to the last empty workspace.
So it looks like a gnome bug to me. Regards. -- Mads Villadsen <m...@krakoa.dk>
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