PlaceFinder: Line1 always blank

I've started integrating the PlaceFinder api into my site, but no matter what address I enter, I get a city-level match with the line1 blank. I've tried a bunch of addresses that I know should work, including examples from your own docs:

http://where.yahooapis.com/geocode?location=701+First+Ave.,+Sunnyvale,+CA+94089&flags=JS&appid=(my app id)

stdClass Object( [ResultSet] => stdClass Object ( [version] => 1.0 [Error] => 0 [ErrorMessage] => No error [Locale] => us_US [Quality] => 87 [Found] => 1 [Results] => Array ( [0] => stdClass Object ( [quality] => 59 [latitude] => 37.403773 [longitude] => -122.006614 [offsetlat] => 37.403745 [offsetlon] => -122.006458 [radius] => 5200 [name] => [line1] => [line2] => Sunnyvale, CA 94089 [line3] => [line4] => United States [house] => [street] => [xstreet] => [unittype] => [unit] => [postal] => 94089 [neighborhood] => [city] => Sunnyvale [county] => Santa Clara County [state] => California [country] => United States [countrycode] => US [statecode] => CA [countycode] => [uzip] => 94089 [hash] => [woeid] => 12797150 [woetype] => 11 ) ) ))