Not at all, Teri. It happens every year after the rainy season. The leaves eventually will fall off and lovely new ones will grow. It's just a seasonal thing.
I'll check tomorrow and see whether the darker ones are more resistant. My immediate impulse is to say that they aren't because I remember noticing that Night Time, which is almost black, was one of the saddest looking victims. It might have more to do with the class or the hybridizer. I noticed that the foliage on Marie Curie, for instance, looked absolutely pristine. It's a Meilland shrub, so I'll have to take a look around and see whether the other Meillands or other shrubs look equally good.
