When looking at a SmartCampaign summary screen, sometimes either the Last Modified User or the Created By user is blank on the below screen. Support has said that the reason is because this user has been deleted from our users list. However, this screen should show the history of a campaign - no matter if the person was removed from Marketo or not - and because this value is missing it feels from an experience perspective that Marketo may be "missing data" or be somehow broken. To resolve this perception, just show some indication of the user who modified/created the asset. I think showing the person's name (even if they were deleted) is perfectly acceptable and would clarify the history of campaigns.
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