In Batch Renderer : the "Blending" progress bar is reaching full extend long before image is rendered. The app seems (wrongly) stuck. Have to wait ~ 1 or 2 mn before image (big - but that's the deal) is created.
BTW Canon EOS 5D CR2 fail (all blurry except center of pano). Had to create the .pano in v2 and then use it in 2.5b2.