Well, if you are having the same problems with three application versions, two of which are known to work well with that printer in ABW mode, it looks more and more like a colour-management problem with Windows 7. But there may still be another issue with the print pipeline. Perhaps dumb question, but are you sure there is no double colour management going on? If you are using ABW, it should be on Printer Color Management, in which case Photoshop and LR colour management should be unselected. Another thing I would suggest trying is to download the Adobe Print Utility and related instructions (free) from the Adobe website, which was designed for printing profiling targets with no colour management, and try printing a B&W version of that file through it to see what happens. It *should be* reproducing exactly the printer response, unmanaged. If this produces off-gray tones, then perhaps one suspects a printer problem. Not sure - this is deductive logic at work - not experience with such an issue.