I am using a new install of ZenCart 1.5.5a with the "responsive_classic" template.... and although Colorbox works perfectly on my PC's Product Information Pages, it only shows the picture on a totally blank page when viewed from any mobile device. (phones or tablets). Colorbox did work fine when I had ZenCart 1.5.4 with the "winchester_black" template.

Any ideas on a fix?
Thanks,
Danny: