Tangentially related...the Flashcam project also is not working with the camera after Diablo. There must be some changes to the camera device firmware/software in Diablo that haven't been incorporated into the "camera" and "flashcam" apps yet.

Not sure if this is related either, but in Maemo.org's table of changes between Chinook and Diablo, there is a change for a package called "camera-test", plus changes to the set of gstreamer packages.
See: http://tablets-dev.nokia.com/changes...2_changes.html