@bigchumpy You need to setup properly the ordering of your images in your products and it should solve that last issue.
@NaturalChaos If you are reinstalling 1.6 with the same package, you will still have the problem. Make sure that you redownload it from our website before reinstalling.
Also, another possibility would be that you had edited the show_block_img or show_default or show files via the menu Display->Views before updating. I would recommend to backup your changes and remove the customizations via the corresponding icon of the listing of views so that the system can use the new views code instead of the old ones.