Yes, when I import your PDF workflow, it does open up in Alfred's workflow tab and allow me to import the workflow. However, upon restarting Alfred, the workflow is gone.
And yes, I'm syncing to a folder on iCloud Drive. But when I try repointing to my desktop or any other folder, I get the error message:
Unable to setup preferences path
Reason: The file “Alfred.alfredpreferences” couldn’t be opened because there is no such file.
So I seem to be unable to re-set the sync folder. I think your diagnosis here and in my other post are correct, though. I didn't see the relation at first, but now that I think about it, nothing that attempts to save preferences succeeds any more. For example, I also can seem to get any changes to the Remote pages to stick, either.