I know that this is not only a 1.3a5 question, but also a Kubrick question.
However it's pointed to the 1.3a author, rboren, and not michael or kubrick's official theme releases.
i'm having a breakdown in background images showing up in firefox. they appear as expected in safari, ie, and mozilla, but for whatever reason they stop appearing after the third one in firefox.
so i get the kubrickbgcolor.jpg, the kubrickheader.jpg, and the kubrickwide.jpg
but the other images, such as the kubrickfooter.jpg are shown in the information and outlines of the dev plugin, yet the images do not load.
it's been plaguing me for days, nothing i do loads them.
is there something wrong in your header image css?