Sounds like a software issue. I know not being able to see the picture kind of defeats the purpose of a FFC, but have you tried to take a picture with it to see what it looks like?
Good afternoon and thank you demmo86rt and Wildman for your responses!
Dougiecuurs, scrambled, 4 squares, black & white are not very appealing on a picture so I totally understand your concern! Is this something that recently started happening? How long have you had your Thunderbolt? Are you using the default camera application, or are you using a different application? If from the Market, try using the default camera. You can also see if this is being caused by a 3rd party application by placing the device in Safe Mode.
If you continue to have this problem with the front facing camera, please send me a Private Message and I will be happy to further assist you personally.
Have you installed any apps, if you have multiple devices doing the same thing it may be a app and it does not have to be a camera app, I suggest you check all apps you installed to make sure they are not linked to the camera in any way or I would hard reset the device and do not install anything and then try the camera, if it functions correctly it is most likely a application causing your issue..
Try booting into Safe Mode and see if issue goes away...
Enable Safe Mode
Disable Safe Mode..