I dunno...maybe try a battery pull with the media card in it? My Sprint Bold 9930 didn't have a problem reading the brand new Sandisk microSDHC 8GB class 4 card I put in. Worst case senerio, just take it into your carrier and they should be able to resolve the problem.
Posted from my CrackBerry at wapforums.crackberry.com
Just spoke to VZ Tech and they said that I may have a bad unit and to take it to the store for a exchange. Thats fine but it is just more time out of my day.