@DH3 This sounds like the same issue we had, as well as others in the past. There's a bug with the camera tag and the devs are aware of it. The simple workaround is here in a quote from my previous post:
"As far as I know, the Corona Camera Tag on the Mac is still an issue. If you copy the camera tag setting to the Camera/Post Processing tab in the render settings and check Use Photographic Exposure, everything renders fine. At least it's an easy workaround."