Same issue here: "file has been modified outside of illustrator" message each time I save this one file - it doesn't happen with every ai file I'm working on. I have Placed .tif files in the ai document that gives me the error. I am saving it locally (not Dropbox). I just upgraded my OS to High Sierra about 2 days ago.
Same issue here: "file has been modified outside of illustrator" message each time I save this one file - it doesn't happen with every ai file I'm working on. I have Placed .tif files in the ai document that gives me the error. I am saving it locally (not Dropbox). I just upgraded my OS to High Sierra about 2 days ago.