Drawing on PS layers, especially layer masks, is displaying in blocks (like rectangular cache blocks) and is increasing the intensity of Levels and Curves layers. I'm also getting blocky results using the Clone tools. I also get (not always, but it does repeat) the increase in Levels and Curves appearence when I simply add a new, blank layer.
Yes, my Wacom tablet is old (Intuos 3) but the rest of the system is new within a couple of years. Photoshop and Win10 are always up-to-date. As is my NVIDIA Quadro M2000 driver. The PC has 16GB ram. PS cache levels = 6. I just upped the cache tile size from 1024kb to 1028kb with no change in behavior. Photoshop is using 8.8GB (59%) of RAM.
The blocky drawing makes me think it's a memory issue but why would adding a new, blank layer change the display (it's like adding 1-1/2 f/stops to the Curves or Levels layer. The attached screen grab shows the blocky nature of some test scribbles on a new layer (note the gray rectangular boxes around the black brush strokes). The capture does NOT show the increased Levels intensity (of course).
The only system hitch I can remember was the recent upgrade of Creative Cloud - meaning I couldn't do a straight upgrade. Nor could I remove the old version. I had to repair the existing Creative Cloud app, then upgrade it, then upgrade PS and LrC. But why would that effect Photoshop? I've seen a variety of recent 21.x display/drawing issues here, but not this one.
Any guidance or point me in the right direction will be appreciated!
Frank
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