Process blocking itself since SP4

Hi,

Since installing SP4 we seem to encounter issues where a process seems to block itself. Has anyone seen this issue. Is this a feature?

Thanks,
Dave

Please refer to the following for more details. This may be the reason

The original posting can be found in many places, for example: http://www.sqlmonster.com/Uwe/Forum.aspx/sql-server/23496/SP4-reports-queries-blocking-on-themselves

There is also a KB article on this: http://support.microsoft.com/default.aspx?scid=KB;EN-US;906344
Thanks