If you rotate the image outside of qimage, and then print with qimage, I guess that would work Ok - just a suggestion for a quick fix if you'd not done so already.

Well, I've also tried using picasa and that seems to have a problem with dimensions too - the page appears long and thin in the preview, and it appears to be stretching the long, thin image to fit the wider page when it is sent to print. So Qimage doesn't seem to be causing the problem, just suffering from it.

@rayw:
Yeah, that does the trick, the problem is when you want to print two different formats from the same image you have to go out and make a second image with the crop applied, which does the job but isn't ideal.

@Terry-M
It appears on the preview, in the page editor and in the print, I've attached a small comparison with the same image before and after rotating. I've reset the Qimage settings, but since it seems to be something up with the printer or drivers it makes no difference that I can see.

UPDATE: it seems to be a problem with windows, I wish I could say I'm surprised. Time to poke it with a stick until it starts working, I suppose.

I think there's something odd going on in the driver too. Is there a portrait-landscape setting - would that make a difference?
Rob, why do you need to rotate and how are you doing it? Are you trying to make a landscape print cropped from a portrait image?
You can do this in the Full Page Editor, maybe you are doing this already.
I've attached some screen snaps from Qimage to show what I mean.
The other way would be to crop to to landscape in the batch filter.
Just throwing things out which may possibly help   
Terry

@rayw
can't find any settings to fit the image to the page. I think it's windows because another computer with an older version of windows doesn't have the same problem.

@Terry-M
The print queue is reporting the size correctly.

The reason I need to rotate the images is that there are often a mixture of portrait and landscape shots that are to be printed on a contact sheet. Since Qimage recognises the orientation from the EXIF data, some images will either rotate to better fit the format of the contact prints, or they will have to remain unrotated and in a much smaller size. I'm currently looking to see if there's an easy way to batch edit the EXIF orientation data.

Yes, I usually have the prints on the contact sheet all the same size.

I have worked out an automated system to alter the exif data using Jhead and a batch file. exiftool looks more flexible than jhead, but there's a lot more reading to do first