>I hadn't found the Filter FAQ - if you prefix your 
>filters with
>-*

Right - -* just disable the default behaviour of the 
engine

>it seems to take care of the problem.  The log report 
>at the end was a little bizarre; it said it had 
>written ~200 files for a total of 2MB, but had 
>scanned 

Yes, the stats are bogus, I will check that. (the 
background system is the cause)