Yes, I'm quite sure that the problem is dsmetool.
I switching to use dsmetool to avoid the impression that the camera starts, and then gets killed by quick-launch, but by using dsmetool seems that the camera-app never gets launched.
I think I will come back to use kill, so everything should work fine.
For the issue reported by Soap77, I've installed transition-control and I've seen that quick-launch doesn't work more, and I've found that the problem is in the dialog that segfaults after you install this package, I'm just digging on it to found a solution.
I hope to release a new version in the coming weeks.
Thank you.