In case others haven't seen it yet, FW 2.1 for the SL is now available. Features are: Support for Leica Image Shuttle 3.4 (MAC)
Support for Adobe® Photoshop® Lightroom® Tethered Plug-In 1.1.0 (MAC)
Improved overall performance
• overall system stability improvements
• overall performance improvements
Bug Fixes:
• Bugfix: in some rare cases the lens profile data were missing in the DNGs
• Bugfix: in some rare cases the camera used “P-mode” for M lenses
• several minor bug fixes

Cheers, Henry