I was going to RMA mines too, but changed my mind when i saw that lots of people were having the same issue. I figure i just wait for new BIOS update. If you RMA yours let me know if it works.
I had the same USB Issue that you did, and i fixed that by installing the Asmedia USB drivers from this site: http://www.station-drivers.com/index.php?option=com_content&view=article&id=1145:rampage-v-extreme&catid=160&Itemid=169〈=en. the error code ...