Problems creating a scheduled package

Hi guys,

I have strange issue, which I can't seem to find anywhere else, so I'm struggling to find the answer. There isn't even a SAP Note for it!

I want to run the Admin_Optimise package on a schedule, during the night, and have never experienced a problem with this before. However, this time when I enter the "daily, 3.30AM, etc." details, and click finish I get this error message:

"[RunQueryToServer][CreateSchedule] Error occurred while creating a scheduling Logon failure: unknown user name or bad password. (Exception from HRESULT: 0x8007052E)"

I've never seen this problem before, and judging by the results from Google, neither has anyone else!!

I have checked all the COM+ components, to make sure the domain account they are using is correct, and have restarted the scheduler-specific one for good measure. No luck.

We have scheduled packages running perfectly in other appsets on the same server, only this one is causing a problem.

We are running BPC75MS SP8, on Windows 2008 Datacentre, with a SQL Server 2008 R2 database.

Please let me know if you can think of anything, because I'm stumped!

Many thanks,

Jason