Comment 3 for bug 312259

Are you mounting /var or /var/run separately from the rest of your filesystem? The permissions look correct on the files and folders (the "s" is setgid). I would suggest trying to reinstall screen, and also upload to this bug report as separate attachments the file
   /etc/fstab
the output of the mount command in a text file:
   mount > mount.txt
the groups command:
   groups > groups.txt
and information about your kernel:
   uname -a > uname-a.txt

Thanks in advance.