I'm having the same problem. I've installed flickrservice v0.3 into a Silverstripe 2.4.7 installation, and I've linked to flickr OK. You can see the results at http://bmtf.org.uk/flickrgallery/.
BUT, click on an individual image and instead of popping up a bigger view of the image, one simply goes to a page containing only that larger image. One has to use the browser back button to get back to the flickr gallery.
I see from my searches that this has been a problem before, but the old solutions don't seem applicable to my versions of the software. I've searched the flickr module for the strings 'jsquery' and 'jsparty' (without the quotes!), but neither occurs in the module's code.
I'd really like to get the popups working in the flickr gallery as it's a great feature for holding people's attention, and showing them around the neighbourhood ...
Any pointers gratefully received!