On the current search page of this site, if you only put a single-word search term, or select 'Match any words', I get the following :-
Database Error
Please try again. If you come back to this error screen, report the error to an administrator.
NOTE: this does not happen on my boards running SMF 0.5p, so it must be something that's changed in the mean-time ;)
Works fine here... Tried a single-word search term AND "match all words" and it worked fine.
Oh, this was fixed, sorry.
-[Unknown]
Phew -- tried it again today & it worked perfectly .. thought I was going mad ::)