Check the printer driver for having "scaling" or auto fit turned on,  or some other interference to the size Qimage is sending to the driver.
Just to be sure, please check the print sizes in the queue. These are accurate. If it  says 24 x 24", then that's what is going to the driver.

Any deviation from that, is driver setting related.

If you cant seem to find the culprit, use Qimage, Help, Reset Printer.
Then reset your paper choice etc.

What kind of printer?


Fred

I started from scratch.  Checked print driver settings, checked the output size from qimage, everything looked good.
Send to print...same problem.

I don't know what an export plug is does, but it sounds like something designed so your printer will be happy with some particular set up.
Nevertheless, I have attached a shot of my screen with your printer engaged, showing the actual print size that Qimage is sending to the driver.
That's what I wanted to see on your screen snap.
What is the actual size that Qimage is sending to the printer.

I also see that you actually have two images to print.
The upper part is a composite all in one image.
The lower part is the same, a composite.
So I made a 31.0 x 24.02 defined page in borderless.
That gave me 24.016 x 31.00 printable area.
I made the car print 24.0 x 30.

As you can see by the information shown in the screen snap, it's all there.
Printable area above the car, and print size in the queue below the car.

That is what Qimage sends to your printer driver.
I cannot comment on what your windows driver is doing to the image without your special plug in.

Best I can do.
Anyone else have this printer?
Fred

That yellow popup is proof positive that Qimage Ultimate is sending 24x24 to the printer driver.  What it displays is the actual rectangle on the printer's canvas so 24x24 is going to the driver and then the driver is modifying the size to override it.  That can only happen if some scaling is set in the driver itself.  I would suggest that you post the screens in your printer driver: maybe we'll see an option that affects scaling.  The only other possibility is that you have a new driver and it is not compatible with settings from the previous driver that was used when printer settings were saved by Qimage.  To correct this, you must recreate the driver settings from scratch.  Click "Help", 'Reset printer settings" and when you restart Qimage, set the driver settings manually (without recalling a printer setup or job).  Once you recreate the settings, you can save them for future use.  If incompatible settings are the problem, they occur when you load an old printer setup or job that has settings based on an old (and now incompatible) driver.

HTH...

Regards,
Mike

I tried turning borderless printing off and it printed fine from qimage. 
When I send it as a borderless print job from qimage, the size gets all messed up. 
When I send it as a borderless print from other programs, it prints fine.

I know you are saying that this is not a qimage problem but it sure appears to be.

So just to be clear, you are saying that if I want to print a borderless 24" print on 24" paper, I need to turn borderless OFF and then make a page size that's bigger than my actual roll width?
This is getting confusing.  I'm in agreement that this is a driver issue but...I don't know what to do about and what you suggested doesn't make sense to me.  Can you explain it again please?
Sorry.

That's exactly what I was trying to tell you.
I quoted what the driver information was telling us.
It was scaling the print because the two "live" choices were each scaling/resizing.
The one we needed was grayed out. That's why I asked you to look in the book.

OK on the cut off white space, I think you are referring to what Qimage does *after* your first try.
It re-sized the page, and consequently the subsequent print too.
It is explained in a pop out message when you are using that cut off white space.
You have to go and reset the paper size in the driver back to the original size.
See screen snap attached.
Fred