I'm having the same problem...
Just started using the Tag Cloud widget (in a bottom part of my front page).
It generates a list of all available tags just fine. Each tag generates a link in the format
host/wr/ngg_tag/%Picture tag%/ as such:
wr is the abbreviation of my site name.
room-addition' is the Picture Tag taxonomy set on the image itself. I'm using a local IP address instead oflocalhost` so I can test responsiveness on my phone and tablet more easily (works the same as localhost).
When you click on any link, a page comes up with that URL, but no gallery. It must be using a blog template, because it shows my temporary text of "Blog Right Sidebar" in that corresponding widget area. I'm using Celestial as the theme, if that matters.
Any help would be appreciated by both of us. If I happen to figure it out, I'll post what might be helpful.