OK, I popped in oneiric CD, chose the option upgrade from 11.10 to 11.10 and went through the installation process. Now switching between accounts works. Some other bugs also got fixed. So I guess the upgrade did not go well but upgrading from a CD fixes it.
OK, I popped in oneiric CD, chose the option upgrade from 11.10 to 11.10 and went through the installation process. Now switching between accounts works. Some other bugs also got fixed. So I guess the upgrade did not go well but upgrading from a CD fixes it.