I changed all the U+202F’s before the +0000’s to simple spaces, and was able to open the file. I then changed the color of the /A cell to red (just to make an arbitrary change), resaved, and closed, and got this when I tried to reopen:
Can you send me that newly damaged file?
Just sent it.
You are using the version that is damaging the files. As I said, I changed the date saving right after versions 3108 was released. It should not happen in 3.3.1 or 3.4. Those versions will show the error with the damaged files but will not damage them again.
Agh. I thought I reinstalled 3.3.1—I did it twice!—but apparently I screwed up somewhere. I’ve cleaned out all my Glyphs apps on both my machines and reinstalled 3.3.1 again, and things now seem to be saving and resaving cleanly. Thanks so much, Georg!