The Lightroom 2.6 update included a bug that could cause Lightroom to crash unexpectedly when encountering certain raw files from the Leica M9 camera. This bug is an unfortunate consequence of attempting to tune our raw processing algorithms specifically for the M9 camera based on feedback on our Lightroom 2.6 Release Candidate. Due to the severity of this bug, we have released Lightroom 2.6.1 with a correction for the issue. This update is only applicable to photographers working with files from a Leica M9 camera.
Thanks for your patience while we resolved this problem.