Settings->RssInjection only shows:
Settings | Donate | Plugin Site | Support Forum"
(and nothing more)
url being /wp-admin/options-general.php?page=settingsrssinjection
Settings link on that page is linked to
which shows the same content, i.e. none.
On a related note, if WP_LANG is other than default (English), RssInjection creates a new menu called "Settings" below the localized Settings. (This WP installation was 3.0 branch so I wouldn't know if 3.1 fixes the issue.)