Can anyone confirm this bug:
https://bugs.kde.org/show_bug.cgi?id=393336

Basically, with a brush that supports rotation, the brush cannot rotate past 180 degrees, when rotation is set to pen rotation. I'm using a Wacom Art Pen on a Cintiq 24 HD. As an example, I have a "half-feathered, half-hard" brush based on a gradient stamp, where basically one end of the brush is hard and theother is feathered. I can only orient the feathered end to point to 0-180 degrees, but not beyond that.

Edited for clarity...