Hi Susan,
This is known to be a problem in some 64 bit Linux environments when Matlab does not load all necessary libraries at startup. In case you haven't solved the problem yet or for those facing the same issue, here is the solution that has been known to work: Create a startup.m script with the following content:
ones(10)*rand(10);
Place the script in the directory from where you launch matlab.This will force matlab to load the necessary library files and you should no longer face the problem.
