I am not certain to which of the photos you are referring. If it is one of the pictures I took myself it was in early May. I cannot say when the reader photos were taken. Certainly, humidity is a reasonable and somewhat likely reason for camera malfunctions but I have used the same camera in many places before and since, some quite a bit more humid than that evening in Savannah, and have never had an issue of any kind. I am not saying it wasn't humidity (no way to know for sure) but isn't it more fun to consider other, less rational, explanations?