I'm on a couple of releases back, using the standard theme and get a search error.
By putting the cursor in the search box (top right) but leaving the search box blank and pressing enter.
Warning: implode(): Invalid arguments passed in
public_html/includes/search.inc.php on line 124
I have in the past been able to do this and didn't get this error and I have not changed any files so not sure why this error all of a sudden now shows.