Xperia Pro/Neo/V/L :: Accessing SD Card Contents?

Suddenly my Sony Ericsson Xperia Pro has a problem:1. The Music application cannot access my track list. When i press the Media Library button it tells me that the Media library is empty.

2. The same happens with the Gallery application. When i open it it cannot display my photos and tells me "0 photosvideos found"....I tried shooting new photos with the camera application but it told me it cannot save files. After trying several times it saved 2 photos so i reopened the gallery application and it displayed the 2 new photos. However it still cannot display my old ones.

3. I downloaded a file manager application from the market and it opened all my photos, videos, and music normally.

4. The problem also happens when I connect my phone to my Laptop using the phone cable. The Laptop cannot see the files on the sdcard except the 2 new photos. However, if I remove the card from the phone, put it in a microSD to SD Adapter, and insert it in my laptop card reader, the laptop displays all my files normally.

5. I copied all the files, formatted the sdcard, and then recopied the files again to the card but it did not solve the problem.

6. I changed the SD card with another one and copied all my data on the new one, however the problem persists.

7. I opened the storage settings and i see that it displays the free space on my sdcard correctly but it cannot display the amount taken by music, photos, and videos.