My situation is similar but in my case I did flash 4 diferent JB roms from the initial leak, and on this week I flashed Vicious from source and just this morning the Team Black Hat rom also from source, on every single case had the same problem, can't see old pics on gallery and can't access most of my data with usb cable on my pc. Every time I wiped everything, for my last one I even restored to my first nandroid from 8 months ago, then again wiped everything and flashed JB, still no old pics or usb access. It is really frustrating.