Adobe has updated Lightroom 2 to version 2.6.1 and is specifically directed to Leica M9 users.
The Adobe® Photoshop® Lightroom® 2.6.1 update includes one important correction that is only relevant for Leica M9 users. This release of Lightroom fixes a bug that caused Lightroom 2.6 to crash when processing certain M9 images. The bug was introduced in the final version of Lightroom 2.6 in the course of making image quality improvements to Leica M9 processing based on customer feedback. There is no need to update to 2.6.1 if you aren’t a Leica M9 user. – Adobe.com
You can download Lightroom 2.6.1 via the following links: