Looks like Microsoft made a security patch that hoses the simpleviewer controls. There is a patch for the patch, but you can't really ask all of your users to do that garbage. The patch is installed auto if you have your settings this way. Have you tried your galleries in FireFox or Safari? I would be willing to bet they work on those browsers.
Perhap Airtight has an idea for a solution? Please?
~ Digital Bushido ~