Product Thumbnails do not always show up

[jays123123]

Please take a look at the image below. I have product thumbnails set up (circled in red). Sometimes, the thumbnails in the red circle do not show up, and I require a refresh on the page for them to show up. Most of the time, this happens when I use the nav (Top red bar) to scroll through different products, but there are other cases.

[jays123123]

*ADDITIONAL INFO
The missing elements show up when I inspect the page, but aren't actually there. (See the attachment)

[jenkinhill]

First:  http://forum.virtuemart.net/index.php?topic=128401  please!

Is likely to be a JavaScript/template issue. What happens with Protostar?