After playing with 4.5.0.52 for a week my phone suddenly developed a massive problem with the media card (didn't add anything, had about 900md's of music & photos from the 4.2 days), causing the phone to consistently restart (phone works fine without the media card). I have reformatted the card numerous times with no luck. I should state that I didn't use the Roxio Desktop Software to add the media, just simple drag & drop via itunes & iphoto to the Blackberry folders marked music & pictures respectively (BTW, this was never a problem in 4.2). Why it started to do it after a week I don't know. I could try and reload 4.5.0.52 to my device but that would reformat everything & make me go through the hassle of getting my phone reconnected to my corporate BES. I'm just hoping someone out there my have solved the issue. Thanks.