To keep the thumbs from floating on large screens, I attached it to the top. Seems to be the easiest solution.
Thanks for your help and appreciate your quick responses.

The thumb count was the problem. Thanks!

To fix the gap on the left side that is set aside for the nav icon, I added to the custom.css file the following to get it to align left with the image block:

.jb-idx-show-area {
left: 5px !important;
}

Now...
just want to get the thumbs bar to stick to the bottom of the image rather than float to the bottom of the page depending on page height.

Any ideas on how to get the thumbs to stay immediately below the image no matter what the height of the page is?

Just bought Showkase pro and am customizing the Kosel theme. I can't get the thumbnails to align left and immediately below the main image.
Also, can't get the Gallery title position to move from the default - bottom left. Tried all the different positions in the General settings but it stays at the bottom left.

work.joecrockett.com/artsy/