Bug in texturepainting?

Hello everyone!

I have encountered what seems to be a bug in texture painting mode that occurs when using mirror modifiers or if I have different faces of an object share uv space. If I stay on the same “side” while painting on something like this I have no issues. If I go over the mirror axis, or from one face to the other, which share uv space it gets a little bit wierd already, but if I go back a second time over the “seam” then I get a lot of artifacts in the texture. Also a lot of these artifacts dont vanish anymore if I undo the paint stroke (ctrl + z ). its hard to discribe this in words, so I’ll just post some pictures.

Do you guys know any workaround or what I am doing wrong?
Note that in the picture I was just painting one stroke evenly over the whole model. So the result should be a completly light purple model, with no patterns. Everything you see is artifacts!

Ps: I was using Blender 2.71, but I also get this bug in any other build i tried, and was trying to follow this tutorial: https://www.youtube.com/watch?v=L7ALfRw6I5I

I was just getting ready to make a thread about this exact problem, I’m doing the same tutorial. All of the official builds, and builds based off of the official builds all have this problem. There is only one build that I can use that doesn’t have this problem, the undo problem anyway.

The GSOC 2013 Paint build
http://www.graphicall.org/1107 -Try it out.

However even that build has some issues of it’s own; sometimes the UV wire will show up in the texture painting, you just have to undo and keep trying until it finally works.

Does anybody have any idea why this is happening to us? Is anyone else experiencing this problem?