I just encountered this bug on a fresh Precise installation, with Alt-Tab and most other window management key bindings not working in Unity 2D.
I looked in /apps/metacity/global_keybindings and /apps/metacity/window_keybindings as suggested by Pawel, and all the relevant values were wrapped in lists, instead of being strings: unsetting them with gconf-editor made them revert to their default string-only values, and immediately restored functionality.
I have not extensively used this installation, but i did log into non-2D Unity a few times before logging into Unity 2D: maybe it (or some other package) inserts these non-working entries into gconf?
Are the list values perhaps part of a migration to multi-valued keybindings that Unity 2D should also come to support?
I just encountered this bug on a fresh Precise installation, with Alt-Tab and most other window management key bindings not working in Unity 2D.
I looked in /apps/metacity/ global_ keybindings and /apps/metacity/ window_ keybindings as suggested by Pawel, and all the relevant values were wrapped in lists, instead of being strings: unsetting them with gconf-editor made them revert to their default string-only values, and immediately restored functionality.
I have not extensively used this installation, but i did log into non-2D Unity a few times before logging into Unity 2D: maybe it (or some other package) inserts these non-working entries into gconf?
Are the list values perhaps part of a migration to multi-valued keybindings that Unity 2D should also come to support?