I wrote a custom multilingual searchwebpart which uses the FullTextSqlQuery class to execute a search query. The webpart is used in a WCM scenario and his task was to find all publishing pages related with the given keyword.
After a while I noticed something weird... the webpart could find all keywords available in various fieldcontrols except for those content available in welcome pages.
After some research, it seems to be a SP bug. Thank goodness, MS has already released a hotfix package for this.