No search engine data?What's wrong?


My piwik works well until 2009.04.30 ,everyday there is about 150 visitors from and 30 visitors from

but these days (after May 1st,2009) there is no data avaliable on "search engine"and “key words”.

i think i didn’t change anything.

anyone who could tell me,the keyword data and the search engine data is in which table of the database?