I noticed this morning after the AGOL update all my sharepoint links broke.
This is the format of the original URL
/Shared%20Documents/
This is what it turns into when you click the hyperlink from the popup and the table:
/Shared%2520Documents/
It double encodes the % and doesn't interpret it as a space. This is something that should have been caught before the upgrade, or at least let people know of the change if it was intentional.