SVG thumbnails not working - iBook library
I'm working with iBooks on my iPad air (IOS 8.1.2). I am generating ePub content for display in this environment. My work is validated with epubcheck within my <oXygen/> IDE. Up until now I have been using .jpg images as cover images and they display just fine in the iBooks library as thumbnails. I want to switch to SVG graphics so they can be dynamic with content titles and localization.
When I do so the SVG graphics render just fine on my inside cover (prior to the TOC) but it refuses to render as a thumbnail on the "library shelf". The ePub continues to validate just fine with epubcheck.
Am I trying to do something that is not yet supported by iBooks or is there something additional that I need in either the SVG graphic or the ePub infrastructure to make it work?
Thanks in advance for your help here
Steve
iPad Air, iOS 8.1.2, iBooks application