SSIS 2005 logging to msdb sysdtslog90 table - event column entries for User:

Hi all - a puzzle:

I have many SSIS 2005 packages set up to log to the msdb sysdtslog90 table.  I love it - it's almost effortless and gives you so much detailed info that you can query with SQL.  The only hassle is you have to purge old entries yourself to avoid msdb database growing continually.

Anyway, in the last few months I've noticed in some environments that new entries are being added with a new prefix in the  [event] column: "User:".  For example as well as "OnInformation", I now see "User:OnInformation".

Does anyone know what that "User:" prefix means and where it comes from?  I'm sure it never used to appear - maybe it's related to SP3 or a post SP2 build?

Thanks
Mike  

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