First of all I'm very happy with the new feature to have the searchbox search multiple fields. However, when I search using "All fields" it seems I always get results, no matter what I enter. Searching on individual fields seems to work correctly. 

To see for your self, enter a random string in the search field on my site: http://www.mwanamaji.nl/index.php/divelog and press search. You always get the same 11 records. Unless you enter a text that actually finds results, in that case the result is the correct records plus there 11 records.

Any ideas?