Hello, fellow Leica-toting PotN'ers. It is with some sad news that I must report a widespread and far-reaching issue with out beloved M9-class (M9, M9-P, M-E and M Monochrom cameras) in the form of potential sensor corrosion. Full details, and updates (including one forthcoming from Leica) can be found here, along with a test to see if you're affected. You have have seen it posted on DPReview as well (which points to the article below).
New Leica "CCDgate" Scandal Afoot?