BB Bold :: Whenever Plug It Into Computer Or Search The Device/System Folders Manually They Are Hidden?

whenever I plug it into my computer or search the Device/System folders manually they are hidden (on the bb) or they are simply not there (when i use the explorer) i hat to format the bb a few times, and the problem gets solved for a few minutes.the deal with this is that when i sync the music, wheter is copy and paste on the explorer music folder in the pc or using the BB desktop manager media sync software, it uses the device space, the music gets actually synced into the device but I cannot access this music from the media library. when i try to it says that there is only 1 song, and its the default one that comes with the cellphone; so I look up in the Files app, Device/System folders and they are all Hidden.

I dont know why this folders are hidden so whenever i wanna have access to my music i have to go to files, device folders, show hidden stuff and finally i can see my songs... the thing is that i have to play one by one and i cannot change or switch apps since its not streaming in the media player....im worried about this, Ive reseted the cellphone, backed up, even formated it at the my computer, blackberry(M) properties..