Why aren't my PictureFill images responsive?

This is my first try at using picturefill (http://scottjehl.github.io/picturefill/#using-picture). The markup seems pretty simple, but the images do not respond to resizing the viewport.  It appears the code selects the correct image for the initial size of the viewport when the page is loaded, but the images do not respond to subsequent viewport size changes.

If anybody can see what is causing this, it would be greatly appreciated.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

For start try to repeat problem with normal, not minimized framework.
dlearman1Author Commented:
OK. I'll try that
you are calling twice jquery remove
<script src="./_js/vendor/jquery.js"></script>

  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
               <script>window.jQuery || document.write('<script src="./_js/vendor/jquery-1.11.3.min.js"><\/script>')</script>
               <script src="./_js/vendor/jquery.js"></script>

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.