How do I trouble shoot a Gnome 3 failure after upgrades on a Debian system?

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http://unix.stackexchange.com – I'm running debian wheezy ( testing ) and after some upgrades my gnome 3 is broken. It's not exactly broken, but it's completey different. Almost like it's no longer actually gnome 3; most of the UI bells and whistles are gone and it mostly look like gnome 2. Anyway, how does one start troubleshooting such a thing? I looked in /var/log/gdm3 and didn't see any glaring errors; I did see some minor errors but they seem to be in the older logs too. (HowTos)