Yes, in your home directory you'll find a hidden file called '.crashplan' that may need to be removed.
Actually, I would suggest just renaming it .crashplan.save for example.

I'm not familiar with greyhole, but could that error be referring to system memory rather than disk space?

How much ram to you have?
Use the 'free' command to check.

If you can, try the full DVD install. I think people have had problems with the express install.

I'm not a greyhole expert, but it sounds like you must have your landing zone on your OS drive. Search around the forums, there might be a way to move your landing zone to a different drive. If your LZ fills up, there is no room left for the OS which can lead to problems. I don't run greyhole myself...

Are you running Greyhole in addition to using the logical-volume manager?

Post the output of this command:
sudo lvs

This will show all of the logical volumes you have.

I'm having a hard time understanding where all the / space went.

Hey, we were all new once! To run the suggested command, you need to open up a terminal window. To do that, on the top menu select Applications/System Tools/Terminal. This should open up a terminal window. Click inside that window and type: su - (followed by 'enter'; it will ask you for the root pas...

Does your hda have internet access?

If so, I would recommend opening up a terminal and use yum to try and get your system updated properly.

I would try:
sudo yum update

Post any error messages that don't get resolved.

Use LVM or Greyhole, not both.

I used LVM for my system, so I'm not sure of the exact instructions to install greyhole.

Good luck with your system!

I'm glad you got it sorted out!

Well, before messing with named.conf, what are your results from the network troubleshooter?

Did you turn off DNS in your router?