Backup problems from Enterprise Manager Database control

I'm having a problem with performing backups from EM DB Control on two of my Oracle 10g 10.2.0.4 systems. When I configure and submit any backup job from EM (either online or offline), the following happens:
- When the job is due to run a Pre backup task has status of 'Scheduled'
- Prebackup task completes and status changes to 'Succeeded'
- Backup task appears with status of 'Scheduled' and value of started time within the next minute
- Status of backup task never changes from 'Scheduled', and the started time keeps updating to the current time
- This goes on indefinitely until I abort the job
At the moment I have scheduled tasks configured to run an RMAN job every night, but I need to get this working through Enterprise Manager Database control. Please help!
Something else which has happended on one of these systems is that after applying some Microsoft Critical updates the database control service would not start. The only way I could find to resolve this was to recreate the Enterprise Manager repository. Could there be a link here at all?
Cheers,
Strak

I think Rodney may have the cause, because the database has been copied. I have looked in every property file I can think of, and then all the rest anyway, and there is no reference to the old host name. And I have ralready e-installed EM using emca -config -dbcontrol db. And I'm definately on the correct port.
So it must be held internally in the database. I've seen partial instructions on deleting the EM repository in the database & java files, does anyone have a full set I can use ? Once that is done, does emca reinstall everything ?
Many thanks, Duncan

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