External Display won't go Fullscreen

I have an Intel-based iMac running Snow Leopard with an external display connected. I want to display fullscreen video on the external display but I'm having problems. Specifically, here is what happens:
Firstly, the displays are not mirrored - which is how I want it.
Secondly, if I pop up an application - e.g. Safari running some flash video - then go to fullscreen, the video displays on the iMac screen - which is what I would expect. However, if I drag the window to the external monitor and then go fullscreen, the iMac monitor (not the external) goes fullscreen - not want I want.
I've found that I move the menu bar to the external monitor (via system prefs) then the external does indeed go fullscreen - but that's not what I want.
So my question is: how do I keep the menu bar on the iMac but the fullscreen video on the external?
Can anyone advise what I'm doing wrong?
Thanks.

I had this problem with an early version of Safari 4. One of the updates fixed it. Are you using the current 4.0.4?
Also, does this happen if you do the same thing with FireFox, Camino, or other browser? How about iTunes, QuickTime Player, or DVD Player?
If it's only in Safari, you can also try trashing the Safari user preference file. It is located at
<user home folder>/Library/Preferences/com.apple.Safari.plist
With Safari not running, move the file to your Desktop, then run Safari so that a new preference file is created.
Note: Some apps have a setting in their preferences that controls which screen gets the +full screen+. So no matter where the window is located, that screen gets the full screen. Safari is NOT one of them.

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