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Not sure if this is down to Mavericks or not, but I am getting black squares appear on my Photoshop images. They appear or disappear depending on zoom levels. They are big squares, and I can zoom one click and they disappear or appear, usually at about the 60% zooming level. I can save the image and bring it back in and it won't be there, so is Photoshop playing up? I've tried switching the GPU off and on in Photoshop but to no avail
I see the exact same thing occasionally in PS CS6. Sometimes the squares are white and like you say they only appear at certain magnifications. I haven't upgraded yet from Mountain Lion so it's not a Mavericks problem.