Yafray sky rendering & composition problem

Hey guys!

Well at first I’m not new to blender. I’ve been using it for 2 years or so but now I dedicated my render work to Yafray and thats where I need your help.

The first problem is that when I use a Photo as background image it never fits the whole camera angle. I tried every option like View,Global, etc. the funny thing is when I switch to Blenders internal render it works perfectly.

Second Problem is that when I use Compositing with Yafray it ether doesn’t work at all or doesn’t update until I click acound in the compositing nodes.

Does anyone has a hint for my problems? I would be grateful