We use the "Send for Shared Commenting" daily with review files hosted on a SharePoint site. Yesterday, it started acting up again like a month or so ago with script errors. It goes from saying our login credentials are invalid (untrue), to indicating our browser needs to be updated (what browser? we're in Acrobat), to not recognizing us when we literally just sent the PDF ourselves. The attached images show the various messages.

This is a pain, because we can no longer see other people's feedback and this is causing project delays.