Ok, I haven't the faintest idea on what is going on. But, just lately every background that I've been putting into Poser6 is like setting up way too low when it should cover the entire background but instead it's leaving a good "inch" of background uncovered. I've tried messing with the camera angles and different camera settings and nothing works. It makes it appear that my Poser figures are enormous compared to the background, like my working window is too big. It will even render the same way. It's been just recently that it's started doing this and I can't figure out why, I haven't done anything different,  I'm quite happy to throw in a background and select yes when it says it's going to adjust my window and it fits. Now, I have the background image sitting like half way down on the background instead of fitting perfectly. I'm quite fed up with Poser6, if V4 would work in Poser5 I'd still be using that. I'm using merchant made back grounds, not the Multiplane or anything. Just wondering if anyone else has had this problem.

If I use the 'auto adjust' for the background it inevitably screws up the background from there on (whenever I leave the material room it shifts the background image again UNautofits it). So I just manually make my pose window match the dimensions of the background (like if it's 1200 x 900 I make my window 600 x 450 ) then I go into the material room and add the background image to the node. Poser wants to offset the U and V... make both values even and zero the offset.

That works for me.  Autofit only keeps my backgrounds from ever fitting unless I never leave the material room.

Also, when you apply some poses and lights or other actions, it cuts your background image node and you'll have to reapply it and zero out the U and V again).

Poser 7 is a whole nother beast I've heard

Thanks for answering. I tried what you mentioned but nothing shifted the background. I've come to the conclusion that if you fiddle with something too much/long in Poser6 it gets buggy. I tried a new project and the starting window was 433x405 and loaded the same background that I was working with on the problem image and it was 1600x1200 and it changed the window to 849x637 and it covered the background but the window was too big for me to work with so I changed the settings back to the original size 433x405 and it created that letterbox look. I selected "match background" and it changed it to 433x325 and it fit the window perfectly. But on the problem image, no matter what I did, the background image never shifted. Weird thing is, I've never had issues with backgrounds before and I've not added/updated Poser6 either unless it updated itself which is a little freaky. I've tried to do a finish render that was bigger than a background and realized a 1600x1200 BG isn't going to look good on a 2500x2500 render...but what I was experiencing was something similar to that, except the image was also positioned lower on the background field and not "centered". Dunno, I'm thinking along the lines that since I've been working on this one Poser image for most of the day, it probably got "buggy" on me and started acting like a 2 year old.

Maybe someone who has had luck with 'autofit' can give us advice - I've never had luck with it.

If it's a scene where you can render the foreground over an empty background then you could save the render from Poser as a TIFF or PSD and then in photoshop or paintshop ( a 2d editor) you could select the foreground as an alpha channel and place it on top of your background image.

Cannot remember but I think the bg has to be cropped (paint prog) to something a tad larger than your doc window. It will not upscale it (auto) like P5 did.