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Quartz Extreme drawing bug?

Title: Quartz Extreme drawing bug?
Has anyone seen what appears to be a Quartz Extreme drawing bug on the MacBook Pro?  This bug shows up as improperly drawn text/ copied during scrolling in dozens of applications — Apple or otherwise.

The appearance of the bug is intermittent, but once it starts, it’s difficult to get to to disappear.

For example, in Safari, if one scrolls the content of a window, areas of the window are either copied multiple times or not redrawn.  However, if one were to resize the window, or do an operation that selects the window content, then the improperly drawn area is drawn again correctly.

Restarting seems to temporarily make the problem go away.  In my case I have a brand-new 17” MacBook Pro with the hi-rez LED backlighting screen.

The reason I suspect Quartz Extreme involvement  is that the drawing defects can be temporarily eliminated by running Quartz Debug and either DISABLING QUARTZ EXTREME or ENABLING QUARTZGL.

There’s a Apple Discussions thread of users who have all had the same problem:

http://discussions.apple.com/thread.jspa?threadID=1419469&tstart=15

Applecare techs seem baffled.

Stephen Greenfield
Write Brothers, Inc.
     
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