After further investigating, I've found the problem again occurs every  
time a new frame is created.

On Jan 22, 2009, at 6:45 AM, Adrian Robert wrote:

> Can you clarify, does this still occur if you either:
>
> a) set use of system highlight color from preferences panel
> -or-
> b) restart emacs after either (a), or (setq ns-use-system-highlight- 
> color nil) and Options | Save Options ?
>
> I believe the only case where it should fail (and this is still a  
> bug) is after just the setq with no restart.
>