when authoring in the confgiration module is enabled, and the website content has atleast another language other than english, there are problems when the other language is selected and a search is performed (check when previewing a page). When the language e.g. german is selected, and you search for a word in german, then results are shown double. It seems as if it shows the expected german results plus one more for each. Let's say in a text component you left it blank the english version and wrote something only in the german version and in a german language. Now if you search a german word, it will show the german result because it is there, and since there is nothing in the english, it will substitute this with the german word, and therefore you have the same result displayed twice.

More details here: http://forum.magnolia-cms.com/forum/thread.html?threadId=e2d65b20-eae3-4629-a4ac-21741398715d