One thing that did happen during install was an error with mogrify.
I set up Imagemagic to /usr/bin/mogrify and this didn't work. (this is the correct directory. However, when I changed to GD2 the directory worked.
Just looking through the config-intr.php file and I found
// The URL of your product dir where your images are stored (with / at end)
$rpdata_dir = "*url*/data"; didn't have the / at the end so have changed that and maybe it will work