RAM Preview at half res = crash ?

Hi there,
I have been having a problem with AE where it will crash on a RAM Preview . . . . but here's the weird thing, it only happens when the resolution of my composition is set to 'Half' ?
It's becoming a real pain, previewing at 'Full' res is too much for this particular project (too slow) and 'Quarter' is simply too blocky to make good judgements about what it is I am looking at, so 'Half' res is pretty much ideal, but like I say when doing a RAM Preview the thing renders a load of frames then AE collapses with the following error dialogue appearing (see image below).
This is not fixed to one AE project, it is happening on the three I am currently working on - I am on a i7 quad core iMac with 8GB ram and After Effects CS4 . . . .
Anyone come accross this (or similar) before, and importantly anyone know how to get around it ?
Cheers for any help,
Lee.

Cheers for the input Mylenium.
I will try it with OpenGL switched off and see what happens . . . .
Also the resolution is non standard (1280 x 540 pixels) - but as you can see it is still divisible by 2 - but I will try your idea of changing the comp size as well - I will probably just make it letter boxed in 720 and see what happens.
Thanks once more, I will report back . . . . !
Lee.

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Hello Mylenium,
First I apologise for my poor english, see it is not my native language.
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Funny you said that.
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RAM Preview at half res = crash ?

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