Run run-subsets.sh (I ran it on Mac). Go through all the demos - all of them start and run just fine. However, after the guimark demos the script is supposed to run three other demos:

    PickTest3D \
    VideoCube \
    WebLauncher \

And they won't start. The command-line used to launch the demos seems to be missing the main class name, and so the java command simply complains and doesn't start anything.