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This seems to be an embarrassing problem to have. I've got a brand new MBP, and I'm having the same problems. I don't know if there's a set solution, but with 4 gigs of RAM and ZERO intensive applications running, this shouldn't be a problem.
 
The command line version doesn't work for me in Snow Leopard, though the Quartz Debug does. One problem though is that it doesn't save this setting after a reboot.

Any ideas how to force it to save the setting?

After making the change in Quartz Debug, you must FORCE QUIT Quartz Debug and the settings will stay. Even after a reboot.
 
This seems to be an embarrassing problem to have. I've got a brand new MBP, and I'm having the same problems. I don't know if there's a set solution, but with 4 gigs of RAM and ZERO intensive applications running, this shouldn't be a problem.

Make sure you're only using 1 monitor. The new Exposé seems to have problems with dual monitors because you're splitting the video RAM in half when running dual monitors. Hope this helps.
 
After making the change in Quartz Debug, you must FORCE QUIT Quartz Debug and the settings will stay. Even after a reboot.

I've been force quitting, but it still doesn't keep the setting after a reboot.
 
SL fail beamsync

Sill bugged here...
Forcing quit and no settings are saved... anyone experienced this?
 
Late to the party, but......

I recently purchased a iMac G5, 1.6 PPC and I upgraded to 2 GB RAM. I noticed the same issue with the dock. I first tried to do a clean install with Leopard 10.5.1 without success. I added the second gig of memory, again without success. I did the command line in the terminal as suggested in prior posts. I did not however install the additional tools, mainly because I couldn't figure out how. But, just by using the command line it rectified 99.5% of the issue. The animation is smoother and when it auto hides is better too. I do have a slight issue when I first unhide it but it seems to fix it.
 
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