I had to reinstall C5 64-bit out-of-box on two machines. Before the reinstall, Matlab 2007a 64-bit worked fine. Now, I get "failed to start the desktop; failure loading desktop class". matlab -nojvm works fine. The reinstall was not an upgrade. I tested on two identical systems - one before I installed the NVIDIA drivers, and one after. No difference. I installed jre and jdk 1_5.0.11 on one system, and redirected /usr/bin/java to the newer one. No luck. I tried installing Matlab as root and sudo, running it as root and plain user. No difference. Web sites aren't helping me much. I performed a complete install (selecting ALL items from EVERY catagory of the C5 64-bit DVD). The machines are not on any network and never will be (both isolated systems) Anyone else with ideas? Thanks. Scott