Hi,

I've file a bug report for this to emacs-pretest-bugs@gnu.org before, 
but it probably got lost so there it is again.

As the screenshot shows, when linum-mode is enabled, the left margin is 
rendered with a vertical line through it. Scrolling hides the vertical 
bar, but calling redraw-frame shows it again. I've tested this on both 
Intel and PPC MacOSX 10.5.8 and 10.6.2.

Jimmy Yuen Ho Wong