I just tried the work around on the Beta Community forum, but it did not work exactly right. I was able to get the viewer to launch, but got this error:
"HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid."
"Config Error This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false". "
I am running Windows 7, 64 bit SP1