We have seen that on non-windows platforms, the GUI installer may hang if you are remotely displaying the installer (via an SSH or xterm session) or if an incorrect DISPLAY environment variable is set. Here are a couple work a rounds we found that work:

1. Install in text mode. You can force a text mode installation by using the "--mode text" option when invoking the installer.
   e.g. ./xjr-1.0.0.9008-solaris-sparc-installer.bin --mode text
2. Remove or correct your display variable.