> That explains the problem.  The time-synchronizer, which synchronizes
> the image and camera_info messages requires that the two messages have
> the same timestamp.
> 
> We no longer get warnings because, I believe, the time in the header
> is no longer a magic/privileged field since auto-filling based on
> ros::Time::now() is seldom actually the right behavior.
> 
> However, I am surprised that the time-synchronizer (inside of
> image_proc) is not producing warnings about not finding matching
> timestamps, this seems like something that would be very helpful in
> debugging this kind of problem.

This is now ticketed in ros#2562.