Yeah. That's a (somewhat) minor error that's been around for a little while. Very hard to pin down and ultimately related to a pure bad luck timing on the bar switch. It should be fixed in nUI6 (at least I haven't seen it in nUI6 yet)
What people don't get is that I am, ultimately, an artist at heart. My brush has two colors, 1 and 0, and my canvas is made of silicon.