I am having the same issue. I just did a clean install of Fedora Core 6 and tried to install Graal with the newest download from the site.
I get this output:
libGL warning: 3D driver claims to not support visual 0x4b
Direct Rendering is enabled, Graal should run smoothly.
Processor Init:
AMD (unknown)
FPU detected
MMX detected
3DNow detected
SSE detected
data directory: /usr/share/graal/
user data directory: /root/.graal/graal4/
The license file is invalid.