When I put this out there years ago it was very inconsistent.  Now it is consistent.  I load images in the queue and crop them in the page editor.  Open any one of them in the full editor, modify the filter and save, and the crops are undone on all images in the queue.

http://ddisoftware.com/tech/qimage-ultimate/page-editor-cropping-get-undone-by-full-edit/

The only way I can make this happen is a case where it should happen.  If you add a print with auto-cropping turned off and then you open the image editor and change/create a new crop that doesn't match the aspect ratio of the image, the print crop is removed because the print size changes (and the crop is no longer applicable to the new print size).

Other than that, I can't reproduce what you reported and I can see no way that editing the image could cause the print crop to disappear: they are stored separately and one does not affect the other.

Regards,
Mike

OK - I resolved this - sort of.  Likely another case of user error.  My fault for probably not keeping up with QU changes (although you will probably tell me this has been there for 5 years - wouldn't surprise me )

In the page editor there is a tick box for "Save crop for this image/size"

If I check that box the crops all stay and there is no problem.  But if I don't check that box, the behavior that I described does occur.

Specifically:

Crop scissors on

Print size 8x10,

Letter size paper.

Add three images to the queue. So there are now 3 pages each with an 8x10 print.

Enter the page editor and zoom crop each print (using the rotate tick box on one of them although I don't think that matters)

Either from the edit page screen or the preview page, double click on any one print to enter the full editor.

Make any edit changes (sharpness, fill, contrast - whatever)

Click "Done: in the full editor (applying the filter only to the selected print)

And  all of three prints have lost their crop settings.

As I say - I have the resolved this with the tick box.

Thanks for the response

Mel, Just for the Halibut, I opened my Qimage (OLD) from 8 years ago, and there's the checkmark.

Fred

Mel, I am too old for brain cramps. I used to get them along with a brain freeze at times.
Now, I consistently walk into a room, stop, and wonder why.
Those are brain farts.

On the Print  cropping, I still am more comfortable with the little box in the Page editor screen.
I use it often when I try to construct a round DVD label from a rectangular cover or poster. I move the little image around trying to visualize a round print surface trying to get as much centered as possible.
I drag, and can see the large one on the left move too. I guess I am used to that.

The other (new) print crop feature is slightly different although the results are the same.
Instead of moving the image around inside the box, with the new cropper, you move the  box around over the image.

Stay well.
Fred

I  didn't remember there was a tick box because mine was always checked. 
So how great is that.
Mel, Let me offer wisdom from my vast experience.

When you wake up in the morning, and you stretch your arms out to the side, and you do not feel wood, it is a good day!

Fred