The same thing happened with my M8 and Noctilux. I took a hex wrench, and using the technique discussed in other threads, and the following photos, seem to have fixed the problem:
http://gallery.leica-users.org/v/rjrose/focus/
If you have to turn the focus toward infinity to get the image in focus, try turning the wrench away from the red dot. Limit turns to about 1 to 2 degrees at a time.
Regards,
Bob Rose