This may be something with the themes mentioned:
Tried this plugin using Twenty Ten, and NomNom (Twenty Eleven child theme).
Verifies API, Social site connections etc.
Does not show connect icons on Comments forms, login or register forms, only the text "Connect With:
Something strange because it did work briefly.
Have also tried to add the hook manually with no result
Version 1.4 and 1.5 tested today.
Have switched to another plugin in the meantime.