Update:
My Hertz redemption (submitted 7-3-2016) has still not posted but my wife's Hertz redemption (submitted 7-24-2016) posted today (7-29-2016).
Looks like I'll have to contact eRewards around 8-28-2016 (as they won't even investigate until 8 weeks after the date of your redemption).
Well, at least my wife's redemption posted without a problem this time ....