Marking as Triaged and raising importance, see reasons in related bug #1058072, comment #6:
"After canceling the authentication dialog you will not get an error dialog, but the comboboxes on the Updates tab will not revert to the original (saved) values, thus you will see wrong values."
Marking as Triaged and raising importance, see reasons in related bug #1058072, comment #6:
"After canceling the authentication dialog you will not get an error dialog, but the comboboxes on the Updates tab will not revert to the original (saved) values, thus you will see wrong values."