Stutters only in Full Screen...

Hi,
I have a strange problem with qt. Watching h.264 material that is streamed with DSS and encoded with the x264 library in mp4live (have compiled it with tweaked encoding parameters). The bandwidth is fine, the material is between 100 and 400 kbits/sec, but it stutters strangely only in full screen mode. even if i zoom the window to almost the same size as full screen its all smooth and fine but when i enter the fs mode it starts to twitch and stutter every so often. looks a bit like dropping frames (not in h264 way but more litterally) but sometimes it displays sort of jumps in the image.
the strange thing thing is that on the mbp 2.16 dual core it seems ok, but on the imac 2.0 dual core 20 inch it displays these problems. upgraded to qt 2.1.6 but shows still the same problem.
cpu usage stays mostly at 30 % (goes between 20 and 50) and memory use is not that significant either. always a 100 MB plus free. am using some encoding options that are heavy on the player (although it seems to deal with it fine) but the inconsistency confuses me...
any ideas?
imac 2.0 dual core, mbp 2.16   Mac OS X (10.4.9)  

Same here. I sent feedback to Apple since this stuttering didn't occur for me before the beta. I suggest you do the same.

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