Hi Guys, I have a Cintiq 21 UX 2010 on windows 8.1 64bit, and have had some issues with jittery lines in PScs6 myself. The jittery lines could be solved by simply installing older drivers. pro636-3 worked fine. Now I have just had a new problem, not unlike yours. When I draw a line it sometimes jumps to max pessure at the start and then stays at max level for the whole line. I did many strokes to test. Sometimes pressure worked normally, sometimes not. I tested with different drawing speeds and happened to notice that, only if I hesitated at the start of the stroke, or tried to draw very carefully, it jumped to max. I checked everything, reinstalled drivers, etc. Here is what worked for me: The problem must have been some odd interactions between tablet, photoshop and windows-native pen/touch settings. Tablet and PScs6 both worked fine. It was the windows pen/touch that distorted the dynamics. Go to these Options and check both Boxes below here: Then go to "PRESS AND HOLD" and Disable everything! (I think this is the most important part, where the tablet freaks out). Then go to the Double-Tap Settings. What works for me is setting the first slider to the max-right; the second slider to the max-left. I think I got the problem in the first place, because I meddled with the settings here to try something and forgot about it. Never had that problem before. I'll update if anything goes wrong again.
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