The brush works correctly before I tried the Calligraphy tool. After a few strokes with Calligraphy tool, the brush tool won't work again. Also, the calligraphy tool seems to get stuck periodically. Thanks for this brilliant software. Reproducible: Always Steps to Reproduce: 1. Use brush tool to draw 2. Use Calligraphy tool to draw 3. Use brush tool to draw again Actual Results: Step three brush won't draw anything. Expected Results: Brush tool should work.
Yes, I can confirm. I'm able to reproduce this bug also on Linux Ubuntu and Krita: 2.9.0 (git 9a0eb68).
...but, there's a reason. After using the Calligraphy tool, you're on a vector layer, in where of course, you can't paint with the "Freehand Brush Tool". By selecting a Paint layer after, lets you continue to paint normally. So it's not a bug. It should be made more evident to a users, that they are trying to paint on a Vector layer.
It has been reported here, also: Bug 342936 - https://bugs.kde.org/show_bug.cgi?id=342936
*** This bug has been marked as a duplicate of bug 342936 ***