It seems this is a feature that not many people use. As a result this was missed when the new gatway quiz summary page was created. Furthermore, in investigating this I discovered that printing hardcopies for sets with the IP restriction setting has been broken for anyone using apache 2.4 (which is pretty much everyone nowadays). There was a call to an obsolete apache method in the hardcopy code. You must have not only been running webwork 2.12, but you must have been using a version of apache before version 2.4.
WeBWorK Main Forum
Hardcopy download issues with IP-restricted Gateway-style assignments
This forum has a limit to the number of forum postings you can make in a given time period - this is currently set at 10 posting(s) in 1 day