My platform is mostly CentOS 5. Issues I have come across:
Problem: /usr/bin/screen (screen) does not function for non-root users in a VE
Cause: Permissions on /usr/libexec/pt_chown are not correct for pty permission changes in a static /dev. It may not be an issue when using udev.
Solution: chmod u+s /usr/libexec/pt_chown
Problem:
udev is running
Solution: chmod -x /sbin/udev (instead of removing it from /etc/rc.sysinit)