We are also having this issue. The plugin worked for a long time then suddenly we are getting the dreaded ‘An error occured (No access token found)’ message. Presumably on an upgrade.
The manual method gives a ‘User successfully authorized’ message but below the message ‘No users available. Add a user by following the instructions below’ continues to appear (ie: no user was added).
Using v1.2.7.4. Have tried activating/ deactivating. Tried on multiple installs – WP 3 and 4.
