Exhibit 1.1b not popping new windows consistently?

I am using Exhibit 1.1b on my site. Up until a few days ago, it was working fine with zero issues.

Now, when I put a thumbnail in using Exhibit, with the purpose of popping up a *new* window it is not doing that consistently.

My most recent post has several thumbnails in it. All but ONE work correctly and pop up into a new window. The first thumbnail does not work, although the code behind it looks exactly like the others.

Any thoughts?

Here is the link: The Cryer