So, far looking at the samples is a little slow for both chrome 5 and firefox 36. Definitely slower in chrome, though, but then this is still silverlight 3, so official support for chrome does not start yet
Ted - have you done much testing in Modelbuilder? I've found a bug that I need to verify. Can you contact me outside the forums at dallen@EulessTX.gov and test a modelbuilder exercise for me?