The Lightroom 1.4 update for Mac and Windows has been temporarily removed from the Adobe.com web site. Those Lightroom users who have installed Lightroom 1.4 should uninstall the update and install Lightroom 1.3.1.(Mac, Win) until a further update can be provided.
LightroomNews » Blog Archive » Adobe Yanks Lightroom 1.4 & Camera Raw 4.4
Ouch. That's no good. There's a bug that affects only Windows users and DNG. There's an Olypmus processing bug. But the killer is a bug in the EXIF timestamping that will modify an original RAW files. Ouch. Get this fixed quick Adobe!!!