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I have this problem in PS CS4 and 5. I am using Intuos4 with newest drivers, older drivers do not make a difference. Nothing like this happens in any other application. The same thing happens when I map pen pressure to opacity rather than size as pictured, i.e. there is a tail of identical opacity at the end. I have a reasonably good PC; I don't think that's an issue (3Ghz dual core, 4 GB RAM). Could it have something to do with the USB or something?
Anybody else has this problem? If anyone has any idea as to what might be causing this, I would be much obliged.
I've experienced this same problem, but I have yet to find a cure. I've never been very happy with the way Photoshop feathers brush strokes, really. IF you find a cure, please post it.