[libreoffice-users] Disappearing images in LO Writer doc.

Using LO 24.2.7.2 in UbuntuStudio 24.02.   But the same happens with LO 25.2.1.2 in Windows 11.

The book has 72 images in 13 Chapters, all B&W .png images of a technical nature. All were inserted in the 
same manner: each inside a frame containing the image and beneath it, a caption "Figure x.x: some 
text". They are all embedded and not linked.

This book has gone through several iterations over the years without problem but the revisions I 
made this year (3 of them - PaperBack, HardCover, LargePrint) all suffer from the same problem. 
Fortunately, the pdf's exported from the odt files are good.

Two of the images, Figures 7.6 and 7.7, are not displayed when I open the odt file. The frames are 
there, correctly sized, no image, the caption appearing at the top of the frame.

At first, I tried re-inserting the two images but then each appeared twice, so I figured that they 
were not missing but only hidden. Subsequently, I find that if I slightly resize the frame using 
one of its handles to twitch it either slightly taller or shorter, the lost image comes back.

Saving the file, closing and re-opening causes these two images to disappear again.

Most curiously, if I open the odt file, leave the Figs 7.6 and 7.7 in their 'disappeared' state, 
export the file to pdf, as soon as I hit the final 'export' button, the two images jump back into 
view. The exported pdf correctly shows all images.

When I look at the parameters of the frames and the images, I can see nothing which distinguishes 
Figs 7.6 and 7.7 from any of the other 70 images in the book.

Can anybody shed any light on where to look to see what distinguishes these two from the rest so 
that I can rely on their visual presence when the file is opened?

Thank you.
Philip
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