nnml errors after upgrade to 5.10

[Mart van de Wege]

Folks,

After I upgraded to 5.10, I keep getting the following error when
fetching new news:

'Mail source (file :path /home/mvdwege/News/listspool) error (Searching
for program)'

To be clear, I read several mailing lists in Gnus, using nnml to split
them into mail groups. I use procmail to filter all groups from my
general mailspool and deliver them in ~/News/listspool, nnml-split
then processes this file to split the mail into mail directories.

This worked fine in Gnus 5.9, but appears broken now. Googling on the
error message gives me lots of Lisp source code, but no clear
indication what is going wrong.

More info:

Gnus 5.10.6-CVS.20050610 (Debian Unstable package)

from .gnus.el:

(setq gnus-secondary-select-methods '((nnml "")))
(setq mail-sources '((file :path "/home/mvdwege/News/listspool")))


The nnml-split statements work, because I can still manually
incorporate postings, using the method described in the manual
(Incorporating Old Mail) (although that does not delete old postings
from the spool-file, so I have to manually delete that one).

Any ideas?

Mart

-- 
"We will need a longer wall when the revolution comes."
--- AJS, quoting an uncertain source.