Sharepoint Foundation 2010 - multiple document upload page blank

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http://serverfault.com – I've been struggling with a Sharepoint Foundation 2010 issue for a while now and thought I'd put it out there to see if anyone has any experience with it. We have a client trying to upload multiple documents to the document library. They can hit the Upload Multiple Files button (which is apparently a big problem for a lot of users, but not relevant here). However, when the multiple upload silverlight control opens, it presents a largely blank screen. All we get is the Overwrite existing files checkbox and OK & Cancel buttons. We don't get an option to either browse for files/folders or (HowTos)