The program itself is fine - it's in DataStage, which is what DTS aspires to be when if grows up.

I confess I don't have the time / interest (ok, primarily the interest) to research it - I'm getting the box rebooted. If that fixes it, I'll just moan about Windows/Sql Server some more, and move on...

Thanks heaps for your ideas though - if I end up having to look into the problem closely, at least I'll now know where to start :)