I semi-frequently experience what seems to be a minor yet very annoying bug when using the workspace switcher, starting in 14.04. I had never noticed this in earlier releases of the OS.
Essentially what happens is I get temporarily stuck in the workspace switcher screen (what shows after clicking the "Workspace Switcher" icon) displaying the 4 different workspaces. Normally you would just click one of the workspaces then ubuntu zooms back in on that workspace for you, however clicking the workspaces seems to do nothing when I am hung up.
This seems to happen only some of the time when I am using the workspace switcher to move an open window, say a nautilus file manager window to another workspace.
I have found that frantically pressing esc and/or the windows button at least 10 or 20 times eventually takes me back to a single workspace view. Also that if that mouse is moved every time I press the windows button the window I was moving in between the ws borders will be updated in position on the screen otherwise it will not move on the ws switcher screen.
How can I prevent this from happening?