Safari 8 graphics distorted
In Safari 8, ever since the Yosemite Beta and continuing through OS X 10.10.1, Safari Version 8.0 (10600.1.25.1), on occasion web pages will start to show PNG graphics as distorted. Quitting and restarting Safari clears the problem. I've not seen the issue in other browsers. Anyone else see this? Any ideas for a fix, or is it a problem with Safari 8's rendering engine and perhaps its compatibility with certain graphics cards?
FYI, I've seen this on two different MacBook Pros w/Retina, one 15" 2012 and one 13" 2013, and a 2010 Mac mini.
MacBook Pro with Retina display, OS X Yosemite (10.10.1), Safari 8