SQL2K Stored Procedure Debugging broken with SP3
Some folks have noticed that Stored Procedure Debugging was not working after applying SP3 to SQL Server 2000. If you run into this, the trick is to callexec sp_sdidebug "legacy_on"
This is a new security switch that was added in SP3 and only affects App Debugging. Also, note that the setting doesn't stick, and you'll need to call it each time you start up the SQL 2K Server.