Ok, thanks so much for your advice. I will contact woothemes about it.
I’ve actually deleted the PP plug-in now and it still seems to appear in the address bar once I’ve clicked on an image – http://www.annadentstudio.com/portfolio/#!prettyPhoto appears as the URL after opening and closing one of my portfolio images.
How do I get rid of it? I know it’s not your plug-in… Thanks for helping.