I'm uploading DKP and first of all I have to say: Love the changes.

I've done 2 raids since the update now (and since we use 2 DKP systems that means 4 uploads) and noticed that only one "Played by Whom?" override is saving.

When does this get saved? Is it only if they receive loot?

It will remember if 1) the character doesn't exist, or 2) the character exists but has no DKP associated with it.

Ok. This is a little sporadic for me then. Is there a time delay (say end of day processing) or would this occur as soon as an upload is committed?

It should be right when an upload is committed.