Nevermind, I finally figured it out.

In my .htaccess I had allow and deny rules that escaped extensions of jpg, gif, png, etc...; however, they did not escape JPG, GIF, PNG, ETC...

As a result, although one of the files was able to "make it through", the others that for whatever reason do not show up as being in the bmz_cache directory, and were in fact in the images directory were not being presented forward from the server.

Problem fixed... Whew. Didn't think it was directly related to the programming, but wasn't sure what oddity was being introduced to prevent Image Handler from doing its thing. Still not sure why the files don't show up as being from the bmz_cache directory, but really more concerned about all of these great addons working for our visitor(s).