Yes. It appears to be a permissions problem. The easiest solution will be to delete the cache folder that is under each gallery folder in the /images directory. I've started to do that and it appears to solve the problem.
By deleting that directory through ftp it causes the system to re-create the folder the next time the gallery is viewed. It is a good idea to clear out those folders periodically anyway. Once they are deleted, they will be recreated with the correct permissions and everything should start functioning properly.