>I am using the 24-70mm f2.8. >When I crop the image to exclude the band the resultant image >is 36.3 MP so no loss of image are. >At the moment I can only open RAW files in Picassa as >Lightroom 3 doesn't seem to have caught up yet.
LR4 is compatible, but has some issues in converting catalogs, LR 4.1 RC is out which I find better in performance as well.
I would suggest trying some other editor, either LR 4.1 RC (which is available for trial and doesn't require getting rid of 3.x), or just try ViewNX which is free, and see if the lines are there.