In Admin>Layout Options if I select thumbnail-red as my thumbnail borders it displays correctly on every page except showproduct (see screen shot). Listings with photos are fine but if the No thumbs default image is called for I just get the background borders. If I select the filmstrip or another border the "No thumb" default image returns.
I would actually need to see the issue etc. The thumbnail red is the same as any overlay. I see no issues using it. All those overlays are the same they load the overlay as the image and the photo is the table background.
Category 1 click on the ad Test which as no photo uploaded. The no thumb image appears on showcat but appears as a black image with just the border on showproduct. If I change to the film strip border it displays the default no thumb image correctly.