I am using Adobe Illustrator and a Wacom tablet. When curved lines are drawn using brush tool, I am getting non uniform stroke widths as in the attached image. Is there any way to achieve uniform brush stroke using a caligraphic round brush in Illustrator ?
It's a known bug. Adobe says it's fixed, but users disagree as you can see from the comments.
My own workaround is not to use such a small brush. Draw the artwork at a larger scale, with a larger brush, on a larger artboard. Alternatively you could scale the artwork up. Seems to fix it too.
Here's a calligraphic brush stroke applied to a path (top), scaling it up fixes the problem (bottom)