I can confirm this bug with virtualbox on Windows 7 host and Debian guest (fresh wheezy install). The virtualbox version is 4.0.12 (for USB comptibility reasons), while guest additions version is 4.1.14. The bug would prevent major applications from starting (evolution, empathy, etc would segfault at start) even in fallback gnome. Updating libgl1-mesa-dri to version 8.0.2-2 from Sid fixed the issue for me too.
I'm really grateful for the tip ;) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org