As has been reported in the forum pretty widely (see for example THIS), on JB'n iOS7 iPhone 5 devices (and, possibly, other models too), the uppermost icons (HDR, flash, camera change) are pretty insensitive and, for most of the time, they only register taps after several attempts.
Fortunately, this is very easy to fix. As the coordinate system of the camera app seems to be moved down a bit, not only the upper part of the camera swap icon is clipped, but also the tap registration area has been moved considerably lower. The following image shows (see the red area at the top) where you should tap - instead of directly tapping the icons:
If you keep tapping there, your taps will be registered almost all the time.
Fortunately, this is very easy to fix. As the coordinate system of the camera app seems to be moved down a bit, not only the upper part of the camera swap icon is clipped, but also the tap registration area has been moved considerably lower. The following image shows (see the red area at the top) where you should tap - instead of directly tapping the icons:

If you keep tapping there, your taps will be registered almost all the time.
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