I have the same problem and found the cause. You can correct it for now by commenting out this line in the /includes/classes.php file
Around line 599 look for:
$submitted = trim( $submitted );
Then just add the comment marks in front of it like so:
//$submitted = trim( $submitted );
This trim is clipping out whatever the array search is looking for. We will have to wait for an official patch but for now this works!
Hope it help someone...