Lightroom becomes extremely laggy when in Library module, previewing a video and scrolling the thumbnails below. Even after the video stops playback, the thumbnails below still move without input as if they are responding to old scroll commands. The CPU is not being used. (6-core mac pro 2010 w/ 24GB ram and 4870 vid card with LR app+catalog on 240GB OWC Extreme SSD)
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