To Fix the linkdead Problem just use instead of the \"planeshift.fragnetics.com\" address the IP of the server (203.81.47.27). This fixed it at me and I think it will fix it at other users, too.
You need to enter the IP in the file planeshift.cfg - look for the line:
\"Planeshift.Connection.Server = 203.81.47.27\"
This is my line and it works.
For the 3D Problem: May it happen that You do not have configured Your Graphics Card right? (e.g. if You got nVidia then the Generic of RedHat isnt ok, You need to install an updated for OpenGL. You can use nvcheck.sh for checking if the Card is properly configured.)
I do not know any other issues yet, Ill post if I find out more.
Prove if Crystal Space is working fine, There is an command, dont know right know which.