It’s not the zip, it’s two files in the zip. All of those images were prepared with Photoshop CS2 and saved for web. All but two show zip compressed another 1%. Two show 0% and when I remove those two files the zip will upload and work. There appears to be nothing wrong with those two files but maybe the 0% compression is causing the divide by zero error? (I can upload both without compressing them.) I guess that means I can’t bulk upload a file that won’t compress further? If so, that’s not good.