When using Flexslider and BackStretcher, Flexslider images don't load

I have implemented Backstretch and used a sitewide context to add slider images for the whole site.

We have flexslider slide shows on many landing pages. When I have a Backstretch reaction in the context, the flexslider images load on first page load, but then disappear once the background images appear.

It happens both when JavaScript aggregation is on and off.

Example: http://wisdom-dev.com/design-dev-b/design-drupal/academics

Any quick fix ideas? I'm trying to get this site launched in the next day or so. If I change this out, I'll update this ticket.

Thanks,

Barb