Yes - there are two of 6 not showing up. One has 127 pictures, the other has 27 pictures. These *were* showing up several weeks ago, I don't know when that changed (it's a client's site, and he didn't notice when they stopped appearing. He says he hasn't touched them).
Actually - you know what? I just went in and looked at these and saw that the image selected for both of these albums' thumbnails said "automatic" where they should be pointing to images. I just changed them to point to two images - and suddenly they're there.
If it's set to automatic, do albums sometimes just not show up?