UBB.threads PHP Forum Software Community Forums UBB.threads Version 7/8 Support Gallery does not show picture but only filename

I want to use the gallery function of the new board, which was one of the reasons for me to went through all the problems with updating the forum. But now I only see the filename and not the picture

Here the link: http://www.uncertaintymanager.com/forums/ubbthreads.php?ubb=showgallery&Number=7