logcheck not working after apt-get upgrade

[Tarapia Tapioco <comesefosse@ntani.firenze.linux.it>]

I just did an upgrade to logcheck version 1.2.36 and now the e-mails
just say this:

#####
System Events
=-=-=-=-=-=-=


Logcheck Warnings
=-=-=-=-=-=-=-=-=
Could not process file su
#####

or this

#####
System Events
=-=-=-=-=-=-=


Logcheck Warnings
=-=-=-=-=-=-=-=-=
Could not process file logcheck
#####

Any idea why, and how to restore it to normal function?