what about Adobe's own tools which throw the document.write warning namely mbox.js and target.js. Will these be updated or will users be forced to move on to at.js? If the latter then when will at.js be supported by DTM?

Thanks, keen to find out information on this as well as our technology teams are keen to move away from utilising document.write across our digital estate.

Are you using the Visitor ID Service?

Thanks, this looks very promising, can you advise how to use this in DTM?

Of course! I can't believe I had to ask! 

I've noticed the same here, if you update a schedule and the start date and time on it is in the past it will automatically rerun the report immediately. The only way to stop it doing this is to set the project start date and time to the next time you want it to run.