Screen sharing and dual displays

Hi, i added a second display on an iMac and often screen share using my MacBook but since adding the second screen i've had issues screen sharing. It will briefly show both the iMac's displays on my MacBook but then cut out with "connection lost", then find the connection again, then lose it etc etc. Sometimes i can select just the first display and it'll be fine but usually the connection keeps dropping and firing up so quickly that i can't get it to just show the one screen.
I unplugged the second display and everything worked fine as it always has done. Is this a known issue to be resolved in 10.5.3? If not is there a way i can change the default in screen sharing so that it'll just show me the first display? I don't need to see the second display particularly so that doesn't bother me.
Thanks, Simon

It may or may not be a common problem, since I screen share a 2-screen Mac Pro from a MacBook Pro and have not seen this problem. I always get both screens.

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6   Foundation                          0x00007fff905277ba -[NSNotificationCenter postNotificationName:object:userInfo:] + 68
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Screen sharing and dual displays

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