Preview rendering stops prematurely : Why?

Hello.
I am using a large photo (3072 x 2304) and animating the anchor point to create the pan and zoom effect between two keyframes.
The comp is set at:
1440 x 1080 (1.33)
29.97fps
The preview rendering stops prematurely. What are normally the reasons for this?
Is the photo too big?
Any tips would be appreciated.
Simon

What do you mean by "prematurely"? There's only so much frames one can squeeze into physical RAM at full res... Lower the comp resolution to Half or Quarter to extend the preview.
Mylenium

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