Just had a mild panic when I switched on my Mac and displayed the desktop with very strange artefacts not dissimilar to a lower colour depth than necessary after updating OSX to 10.9.3
I wish I'd got a screen shot to aid recognition, but it may have not been relevant any way. The areas that I now see that were problematic were predominantly white, and possibly even transparent or overlays. It appeared on bitmaps, window chrome and the OSX Menu Bar and menu items when highlighted. Essentially, it looked like a fog/glare or that anti-aliasing was incorrectly applied. There was a few greens/purples punching through, too. I've seen similar faults when a flatscreen monitor was dropped hard on a corner, but two at the same time?
I tried detaching both my monitors (one on HDMI, one on Thunderbolt) and cycling power on both monitors. I tried using one at a time, but regardless of monitor/port combination, the glitch remained.
Had a Google about and noticed that 10.9.3, which I'd upgraded my Mavericks OS to the last time it was switched on, had a few users of older machines complaining of a similar but not the same glitch. As I'm relatively new to the Mac OSX world, I sighed and thought I'd look into how to work around or try to ignore it until a fix is released. I'd noticed that previous updates that involved graphics driver improvements had similar unintended problems for older hardware.
So only one thing left to try. The IT Helpdesk standard "turn it off and on again". It worked. As silly as it sounds, it does work more often than I'd care to admit. Hopefully this doesn't become a recurring fault.
I've tried looking for a screenshot of a similar glitch, but no one seems to have posted one - they seem to be much more broken than mine was.
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