I work on both an IMac and a MacBook Pro. For the last day-and-a-half, I am unable to sync versions to Dropbox. I am in editing phase, and edits I make in ProWritingAid are reflected on the Imac version, but the version on the MacBpook Pro is unchanged. Yes, I am in the same folder on both machines and there is only one file with that name in each.
Did you check that the Db app is active, logged in, on both machines?