From the documentation page:
It looks like all the API queries are working except for the one for the following, which retrieves individual player stats for a given week:
http://fantasysports.yahooapis.com/fantasy/v2/team/[my_league_key].t.9/stats;type=week;week=2
I get an "invalid oauth signature" error:
{'status': '401', 'transfer-encoding': 'chunked', 'vary': 'Accept-Encoding', 'connection': 'close', 'cache-control': 'private', 'date': 'Sun, 27 Jan 2013 03:38:44 GMT', 'content-type': 'application/json', 'www-authenticate': 'OAuth oauth_problem="signature_invalid", realm="yahooapis.com"'}
Is this the real problem? Every other API on that page works works for me.