...but still not sure what's causing it.
There is a View setting of Medium or Large. Medium is the default and you get the bottom part of the picture messed up (if the picture loads at all). By clicking Large, the picture displays.
Tried both IE and Mozilla with same results. Don't have problem with any other Yahoo Group, so must be something about this site. Pictures take an inordinate time to load, though, even with a broadband connection.
Wait is definately worth it!