There seems to be a major bug in the Lightroom dual monitor support. with the primary screen in loupe view and the secondary screen in either loupe view or grid view, the application will produce the infamous spinning ball. Occasionally, this will fix itself after a minute or so, but more often than not, a force quit is required. In all cases, the Lightroom cpu load is ~98%. This is running on a Macbook Pro, 2.4GHz, 4G ram and 10.5.4. The bottom line is dual monitor support is not stable.

Update: since I was having problems with dual monitor mode, I went back to using just the one. I’ve had one hang using normal loupe view whilst doing simple reject editing on folders. I’ve also seen the system hang for a minute or two whilst it Lightroom thinks about things.

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