My Smartphone Is TOO Smart

[Moon_Juice]

BB Curve 8900
OS v4.6.1.231 (Platform 4.2.0.108)

Current Settings:
Memory>Encryption Mode OFF (now)
PWD> Disabled
Security>Content Protection Disabled/Include Contacts NO
Security>Content Compression ENABLED

I have searched the Internet and I have seen others with my problem but found no answers. I took a number of videos on my Curve 8900 before I knew to disable SD Card content protection. A few of these saved as .3GP files that are fully usable on both my device and my laptop. These videos were fully viewable and shareable even though Options>Memory>Encryption Mode was enabled in "device mode" with "encrypt media" set to "yes" at the time these videos were shot. During this same time period, other videos I shot were saved as two files each, one with a .3GP.lock extension and another (with an identical filename but much smaller nominal file size) with a .3GP.lock3 extension. These videos with .3GP.lock/.3GP.lock3 extensions do not play on my device or my laptop, and return an error message on the device: "unable to display file." I've tried renaming them, rebooting my device, turning off media encryption, turning it back on, disabling the device password, pretty much everything except setting a new media encryption password or pulling the battery. I have made backup copies of all the affected videos on my laptop and on another microSDHC card of the same size as the one I am using. I ran CHKDSK (with both options checked) on the memory card using my laptop, but I didn't see any error messages.

Under my current settings, which I have listed above, I successfully shot and viewed a video on my 8900 not half an hour ago, so I know things are working - except that when I went to rename the file I got a "file system error" dialog and the device wouldn't let me rename the video (UPDATE: I've been able to rename the video, but it's a copy of the original and it's on the second memory card, not the one to which it was originally saved).

These videos are important and cannot be replaced or re-shot. I understand that if I don't enable content encryption this probably won't happen in the future, but how do I decrypt the videos I already have? I need to be able to view and share these video files. I cannot stress enough how important these videos are and that they cannot be replaced. I need to know how (and if) these video files can be salvaged.

Is it possible this is a "known issue" and if so, is there a fix available?

This device was purchased NIB in-store about two weeks ago.

Can anybody help me?

[bluzthyname]

never heard of such a problem;did you search the forums?

[Moon_Juice]

I have searched everywhere. I have also tried going to my carrier and to BlackBerry tech support, and from what I can tell, this issue has stumped even them.