Mac OS Monterey, 2020 Macbook Pro. My files are saved to a local Dropbox folder, which has never been an issue in the past. I made changes to a file, changing strokes with manually added arrowheads to strokes with arrowheads. I saved the file and closed it. When I reopened the file, no changes had been saved. I recreated the changes, and did a save as with a new file name, and the changes were saved. I went back and tried adding the changes to the original file, and it confirmed that AI 26.1 is not saving changes to files. I have downgraded to 26.0.3, which fixes the issue, but I have lost all of my workspaces.