Reply To: Epub Validator Warning

I’m getting this validation error too (although everything looks OK in previewers and an actual Kindle). Here is the relevant bit of the generated CSS. I actually started with the ebook template made by Anne-Marie, so images had the object style Above line centred. Any ideas what’s causing this please? Should I just ignore it?

div._idGenObjectAttribute-2 {
height:100.00%;
left:0%;
overflow:hidden;
position:absolute;
top:0%;
width:100.00%;
}