I am running 4.5.0.55(81) on a TMO 8320 and the other day, a weird problem started.

My phone began locking up and giving me App error 200. Wiped w/JL Cmdr and reinstalled OS several times, no change. Tried it without the SD card, and it works fine. As soon as I install the memory card and restart, same issue. Once the issue starts, the issue continues even if the memory card is removed.

Any ideas what could be causing it? I am going to reformat the SD card in my PC and reinstall and reformat in BB and see if I have the same issue - wonder if it is a file on the card - all I did was download some new home screen images the day this all started. Card contains pix and ringtones, only 10% full (8 GB SDHC card).

There have been many reports on this site of needing to reformat the micro SD cards after upgrading. that fixes the problems.

Thanks, but the issue did not start when I upgraded. I upgraded the OS a few weeks ago - the SD card worked fine for weeks, and then just the other day started causing problems. When I first installed the card, i reformatted with OS 4.5 and it worked fine.