It may be that they used the board audio to test the installation. If that was the case they probably had to use MME drivers.
Also RME drivers for the FF800 no longer support MME.
Another point is that Windows can't use ASIO drivers so make sure not to let window sounds be active and play through your FF800. I always use my onboard sound device for windows programs like media player and windows sounds. It works as a decoy and that way Sonar will always load with the drivers that were last active which should be ASIO. Hope that helps.