I just rebuilt things for the 2.0 content. I exported from BBmanager to the SD card but when I insert the card into the BB it says “No Song”. There is a project on the card, There are songs in a song folder in the same directory as the project.
Is the SD card between 4-32 GB in size?
Can you send a screenshot of its contents?
I was using the original 4 gb card. I decided to try a 32 I had and it worked. I am thinking the card was bad. I use macs and if I reformat a card for use it seems that an MS-DOS format works best.
Check that the 4Gb card was not locked. You might be able to format it and see if it comes back to life. 