No I don't know either why it is blinking. Perhaps due to some event cables, or a bug with the images on top.
Perhaps try with a Render Layers Ton Window instead, here with this method it does not flicker for me. May be better methods though.
PS : Put the vuo file in your same folder as the original one as it scans the folder WERKEN that has to be in the same folder as the file.
But I have always wondered if in the end compositions could not be some kind of bundles, like apps actually, with a part of them having the code, but that we could also bundle sub-compositions (password protected or not ((see Feature Request about protected compositions for sale purposes)), modules, images, movies, fonts etc).
These would be absolute shareable compositions.