when I boot off MMC. When I boot from flash it works as normal.

In both cases the videochatting camera app autostarts and runs like it's supposed to, so there's nothing wrong with the camera, it's just the MMC version of Knips, which I assume hasn't changed recently? Is there some other app/repository that I might have installed that would interfere with Knips' function? Is there some other useful camera app that I might use instead?