I am having trouble with workspaces. All workspaces are exact copy of the default one, i.e., I can't start a blank workspace and do something new. There are no blank workspaces, all of them are replicas of current workspace and if I try switching I only get back to where I was.
I'm using Ubuntu 14.10 and running GNOME Shell 3.12.2. Note: I have enabled workspaces using GNOME Tweak Tool.