after updating to Mac OS 10.13 I get this file has been modified outside illustrator. do you want to continue?
We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
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Joe Tree commented
Having exactly the same problem. All my live work is in the DropBox folder on my MacBook which is constantly synced with DropBox servers—assume it's something to do with that (perhaps DropBox flagging the file as updated when it's synced, which would happen in between each save).
Only started after updating to CC2018.
Getting the same issue with saving of existing .ai files.
It will save fine without a message and I will only have to move one thing in the document, try to save it again and i will get the popup: "this file has been modified outside illustrator" the next minute. I save to a dropbox folder and the problem started after upgrading to high sierra (OSX 10.13)
I have the same problem with 2017 and 2018 AI. It happens to my old files and new files but not all the files.
Jim M commented
I'm getting the same issue after updating to OSX 10.13. I updated Illustrator to 2018 version but it is still doing it. I see it mostly when I'm saving my files in .AI format.
This morning I updated to Adobe 2018 and the problem still persists. I can move things in my drawing and save but if I add to the drawing it throughs up the message about modified outside of illustrator and so to be safe I go ahead and do a save as. Very strange.
Also it has started the problem with the save as with my 2016 MacBook Pro. As always I save as ai files. I have tried resetting illustrator which fixes some of the pallet problems but not the save problem. I can work around but its just vexing. Thanks
I get this message when saving as ai file to my desktop that is shared when another computer using iCloud. The message does not appear if I do a save as only when I just hit save. This started when I up graded to Mac OS 10.13 on a 2015 iMac. My 2016 MacBook Pro doesn't give me the message, possibly because when I use it it is only connected to iCloud and no other computer at the time. Sorry for lack of clarity.
Nick Rougeux commented
I get the popup when saving to an AI file. I get it when saving to a Dropbox folder but only I have access to that folder.
Nick Rougeux commented
I have this problem as well. I can't reliably reproduce or trigger it but it happens. Nothing to my knowledge has changed the file.