error writing to filter (bogofilter)

Hi,

After an upgrade to Mac OS 10.8.4 (64bit) from 10.5.8 (32bit) I
get the following error for _some_ messages:

temporary failure.
Command output: maildrop: error writing to filter.
/usr/local/bin/maildrop: Unable to filter message.

The offending rule is rather bog standard:
xfilter "/usr/local/bin/bogofilter -u -e -p"

Trying the bogofilter suspect on an offending message however
seems to cause no problems:

$ bogofilter -u -e -p < testbogomsg 1>/dev/null
$ echo $?
0

Of course I recompiled all involved programs, like maildrop,
bogofilter, tokyocabinet.

What could be the problem?

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