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I have PM running on a 17" MacBook Pro. On Friday I would have been working using the built-in display. Because I move around a fair bit I tend to just put the Mac to sleep rather than closing it down. Back at my desk I connect to an Eizo display so at 09.02 today I would have connected the display and woken the Mac. Because of the way I work all of my applications can be running for days before I restart the laptop. The last restart was probably on Thursday of last week when I installed a MBP firmware update.Thinking back to this morning's session, my perception was that everything was fine in PM until about midway through my edit when I noticed the colour in the contact sheet view seemed to be adrift. To my eye, the previews seemed to be OK at that stage, that's possibly just my perception but I'm reasonably confident of that statement. Eventually I realised the previews were being affected too. That's when I generated the log file and restarted PM, which restored normal colour.I wouldn't associate the problem just with the external display in itself though, once I notice the colour is adrift it will also be out on the built-in display. If it helps, both displays have been profiled in i1Profiler.Thanks for your continued attention to this. Much appreciated.