I have such problem:
Search is not working correctly.
Search works, if it is done from the home page (or index).
If I open particular result and see, that this is not what I was looking for, I'm writing other search phrase, and this gives 404 error.
myblog.com/?s=phrase <- works
myblog.com/index.php/?s=phrase <- works
myblog.com/index.php/page_name/?s=phrase <-not working