While drawing, this pop-up regularly comes up and asks me to update my font. If I hit reject, everything is okay, but it comes back a minute or so later. If I hit update, it starts deleting the glyphs I just worked on, rendering my progress gone.

I originally thought this problem occurred because of copy/paste of vector graphics from Illustrator, but I'm now suspecting it has to do with the fact that at any given moment I'm working on a server or Dropbox. Happens while using both.

Is there a way to stop this pop-up from happening? It seems the server or Dropbox is pushing outdated edits to the font in the same way something like MetricsMachine would.

If I hit Update on the dialog above, /K /L /M /N get deleted.

Thanks in advance,
Ryan

this may be useful: Working of a remote file server: troubles & fixes

you can disable automatic checking for external changes:

from lib.tools.defaults import setDefault
setDefault("enableExternalFileCheck", False)

…and enable it again later.

hope it helps!

Specific to RF3 update: some of the pop-ups now have been layer-related. And if I click update, it hangs.

another solution would be not working directly on a server or DropBox folder, if possible. you could ‘check out’ the font to another place, edit, and then check it back into the server. (or use a version control system like Git, which works just like that; see this tutorial in the new docs.)