The site that effectively "stopped" this afternoon was http://www.vesdfw.com. This is a site that's basically Under Construction, but the Home page is LIVE - none of the other pages have been linked to the main navigation yet (waiting on client approval)
Another site under construction is http://www.ntx06.com, but this site is not LIVE. I can work with you tomorrow if you like, reinstalling WP Super Cache temporarily if this will help - I'll just want to let my client know we're testing something.
Two other sites I launched today both had to have WP Super Cache removed in order to work - http://www.nomads-music.com and http://www.rguco.com. Both sites are LIVE, so I don't have a lot of flexibility in messing with them too much. The owner of http://www.rguco.com doesn't check his site often, so this might also be an option.
One more site - http://www.ntx05.com - is also under construction (waiting on client input and approval). I can also work with you on this one.
Lastly, my own personal site (www.northtexas-webdesign.com) will not work with WP Super Cache, but it's NOT U-Design.
There are more, but this should be enough.
Just so you know, when it works, WP Super Cache is the best caching program I've tried. Far better and faster than any others I've played.
All these websites are all on my Windows 2008 R2 cloud server at the Enterhost data center in Ft. Worth (please don't tell me I should use Unix hosting, because WordPress is php. PHP runs just fine on Windows and I clearly prefer Windows servers over Unix).
I'm more than happy to work with you to address these issues, as I really want WP Super Cache to be my "go to" caching application.