That would mean you did step3 if it works. I can say that without a doubt as if step3 had not been done they would not show. It is pretty absolute in the new code we do not parse the userid before the image after PP5 so your bigimage field in photos in step3 had to have been run prepending the userid to the image name in the bigimage field
Looks fine EXAMPLE HERE
http://www.toyotanation.com/photos/s....php/photo/200
You say you did not do step3 yet look here is a very old photo
Look at this user 2 image is being shown.
Look at the code in showphoto
$imgurl = "{$Globals['datadir']}/$storecat/medium/$bigimage";
That means you definately ran STEP 3 of the upgrade