Very interesting .... I've never had either of those problems but, then again, I haven't rented from Dollar in "quite a while" (i.e. 4 rentals in 2012 with lots of cancellations and re-bookings for better pricing but no 2013 rentals).
Hope they haven't created a "new and improved" system like Alamo's. Used to rent from Alamo quite often but since they implemented their latest and greatest reservation software, I've quite trying ....