Figured it out (big old duhh) It was not the naming conventions but I had generated the gallery using the default 85x85 thumb size and I had batched MY letter-boxed thumbs at 100x100px. When I replaced the thumbs in the folder with mine they were bigger. Still don't know why 2 of them showed up? When I generated the gallery using 100x100px and switched them out all is working.
Thanks for your help Steven.

Here is my gallery test with the thumbs created with JuiceBox builder pro. In this case they show up both locally and from server.
yourspace.minotstateu.edu/russhanson/index3

I will try your suggestions but I don't think that's the problem. The page displays the same when I open it locally.

Thanks for your quick reply. Here is the URL.
yourspace.minotstateu.edu/russ.hanson

I too would like a "scale-to-fit" option for the thumbs. I tried replacing the generated thumbs with my own sized to fit 100x100 px.
I have 10 images in this test gallery and when I open up the index.html only numbers 8 and 9 show up in the thumb preview. They show up correctly but the other boxes are black. When I click on one of the black thumbs it opens the right large image. I just started with this program and I really need the thumbs to show the entire image.