I have just created a new installer using the new surface theme.
The installer will install the product successfully, but when it is on the progress dialogue of the copying files stage the bar goes up a tiny bit, then back to 0% then 1%.
It repeats this process all the way through, but interestingly, the progress bar on the windows tool bar at the bottom is working correctly.
Using Windows 7 x64
When I un-install the software, the progress bar works correctly.