Apparently nobody is interested in this issue.. :-( People having paid for this feature it seems quite frustrating
Why do you think that?
I'm currently not able to reproduce such lines in Chrome on Windows 7 - maybe it depends also on the GPU or driver - but I'm of course aware about the these 'flickering black areas' at the cube joins which are happing since Chrome 22 or 23.
The next krpano release will have a completely new and better CSS cube-overlapping rendering that should hopefully finally avoid/hide such browser bugs, even when Google (or any other Browser developer) is changing its CSS rendering again...
Best regards,
Klaus