Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Lightroom 2.7 Released
Adobe have released Lightroom version 2.7 and Photoshop Camera Raw 5.7. Both applications are available for immediate download from the Adobe website or by checking for updates from within the application. The update adds raw file support for nine new popular camera models, including the Canon EOS 550D, Sony A450 and Olympus E-PL1. A full list of the newly supported cameras is below.
Lightroom 2.7 is available as a free download for Lightroom 2 customers, and Photoshop Camera Raw 5.7 is available as a free download for Photoshop CS4, Photoshop Elements 8 (Win/Mac) and Premiere Elements 8 customers. The DNG Converter 5.7 is also available as a free download for all customers. Visit the Adobe website for more information and to download the updates.
Newly Supported Camera Models:
Canon EOS 550D (Digital Rebel T2i/ EOS Kiss X4 Digital)
Leaf Aptus-II 8
Leaf Aptus-II 10R
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