Why doesnt yafray work within Blender anymore?

Why can’t I watch yafray (XML button unchecked) during render? What do I need to do to have this back?
Thanks for all your expertise.

For yafray to work within Blender, I have been told that they both have to have been compiled using the same compiler, for various reasons. I’m disappointed that it doesn’t work now also, but I don’t know of a fix.

Yaf(a)ray ?