Bug: Artboards & Content are displaced after saving and opening a file
After saving & opening a file with multiple art boards, many of the artoards and/or their content is shifted around the canvas. I already tried all kinds things, even creating a new file and copying everything over. The bug happens again and again – and it's unpredictable, sometimes it's just one element, sometimes it's half of all the content.
Working with Version 29.8.1, the file is in large format mode, Mac OS 25 (latest). Not saving on a cloud synced folder.
When saving the same file into Adobe Cloud, the bug doesn't seem to occur... at least for the last few times I tried. But actually I don't want to save them there.
Also, when saving onto hard drive, sometimes a dialog appears that the file was changed outside of Illustrator (which is not true).
See attached file (blurred): the grey boxes on top come from the artboard on the bottom and the red ones from the artboards below.

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Robert commented
I've sent a file by email, thanks.
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Nichola Dos Santos commented
I have been having the same problem all week, its ok with old files but anything new I create with multiple artboards when I close and reopen some but not all arwork has shifted down and left, some ends up on top of the artwork that hasnt shifted. If you space bar the file and preview it it looks fine, its only when you open does it all move. Please help!
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Priscila Gonzaga commented
I also had the same problem, I just had to re-do the file because I was in such a hurry. I thought it had to do with the fact that I used a lot of repeat objects to create patterns, but after seeing the other postings, I'm discarding this thought. Also, some of the texts frames looked like they were doubled, with an invisible pair of the same size. I use dropbox, but by chance this file was saved in the downloads folder, so it wasn't a cloud problem in my case.
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A very similar problem happened to a document that worked just fin before — a part of the document jumped up and right. Some of the shifted elements were children in groups that stayed in place. The shift amount was integer values, but I didn’t figure out what it was in relation to the layout.
I was not using the large canvas though, and this happened after a crash. What’s even more odd, that this bug also cursed previous versions of the same document (managed wuth Dropbox). -
Ton commented
See also this post on the Illustrator community forum: https://community.adobe.com/t5/illustrator-discussions/illustrator-pushes-artwork-off-artboard-after-saving/m-p/15521501/page/2#M454167