attach your actual VI! (use Explorer or Chrome if Firefox does not work)
By the way: why should it work??? A picture ring is not a picture control! Why do you expect that you can connect them with a wire???
edit: After some search on the forum, and looking at the property node options for a Picture Ring, it looks like, you can NOT dynamically change zoom factor of a picture inside of a Picture Ring!
But why do you need to use a Picture Ring? You could dynamically load any picture you want at runtime, and zoom in/out. So do not use picture ring if you want to change zoom factor...