For the past 3 days when I try to search for my posts I receive the following error script: "Warning: strpos(): Empty delimiter in [path]/includes/functions_search.php on line 838"
Don't know if anyone else is having this problem but it is annoying.
It means the second parameter being passed to that function is empty (when it's not supposed to be). Essentially what is supposed to be being searched is being passed but not what is supposed to be being searched for. It's a programming bug.
Shouldn't be too hard to fix with the assistance of vBulletin support so long as they haven't gone down-hill too much further than the last time I worked with them, and they're still providing support for Version 3.X (which I thought they discontinued).