I rebooted my box this morning (RHEL5.8, 64 bit) and tied to log in as a regular user, but got this message:
GDM could not write to your authorization file. This could mean that you are out of disk space or that your home directory could not be opened for writing. In any case, it is not possible to log in. Please contact your system administrator.
When I log in as root, my user home directory has plenty of space (>1TB out of >2TB), it can be opened and accessed. I can login from the command line
and this puts me into my home directory.
Please help to identify and fix the problem.