I can get the plugin to work for the posts which contain photos, but it takes an age to load if it ever does. I didn’t wait to find out. So I deleted that and relied on the widget alone. No luck there either.

I think the problem is that my server is not using PHP 5+ to support my blog. I have also emailed PicLens.

If you too cannot add this to your blog, what you can do is download the piclens Firefox add-on. Then on other sites you can click on any image where an arrow appears and that will open up your browser so you can see the slideshow of any one else’s pictures.