I recently purchased an open pandora off ebay after alot of waiting and searching, hoping for a great item for programming and gaming. I am mostly pleased with the unit except the nubs don't seem to work correctly. They will sometimes only go in one direction and not the other, and the movement seems to vary, it is not any one direction it has issues with, it varies. IT is a first batch unit if that helps. Please let me know if anyone has had any similar issues and if so, then what was the solution. Thank you!