I upgraded to 4.5.0.77 for my Curve 8330 and the memory card i have inserted (nothing special just a 2Gig card i got at micro center for 6 bucks) no longer is available. I send myself new mp3's via email all the time and my device memory is now full and i need space. I'm wondering if the upgrade could have done something to my card? If anybody else has experienced, let me know what you did to get it fixed!
Was just having a similar problem. I bought a new 4G card and the BB would read it sometimes. It woud allow me to see thumbnails of my jpegs but would not open them. After 2 days I figured it (probably the easiest solution I was overlooking). I formatted the sd card on the BB, removed it and transferred all my jpegs, ringtones, and videos to the new card. In the card I had to make new files. Kind of a BS way to get it working but it works now. Hope it helps (I think it just Verizon's version of every phone thats the problem).