bogus information in logwatch reports

[Tim]

What is it that determines when to report something in logwatch
regarding yum, etc?  I get entries like the following, when it was
days/weeks/months ago that it was installed.

 --------------------- yum Begin ------------------------  
 Packages Updated:
    SDL.i386 1.2.8-4
 ---------------------- yum End ------------------------- 

I would expect logwatch to just report what had changed since the last
logwatch.  But this sort of thing keeps on appearing each time on some
machines.

-- 
(Currently testing FC5, but still running FC4, if that's important.)

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