NETGEAR USB Control Center utility for MAC OS X El Capitan

I was having the same issue (the USB Control Center freezing and printer networking through the Netgear wireless router not working) after installing El Capitan... For months.

However, more recently, my HP printer worked when (1) I force quit out of the Netgear USB Control Center, and (2) I plugged the printer directly into the USB port on the back of my R7000.  It simply came up as a Bonjour printer in the Printers & Scanners of System Preferences, so I added it to my list of printers, printed a test page, and have been printing flawlessly every since.

I made sure to install the most recent firmware from the support page for my router.

The Netgear USB Control Center that Netgear included with the router was one of my Login Items, and it was hanging/freezing every time I started up. The solution for me was to remove it from my login litems (and probably uninstall it, but I have not done that yet), and just use the printer plugged directly into the USB port in the back of the R7000 without any Netgear utilities, but with the latest firmware.

So whatever Elaine and the rest of the Netgear team might be beta testing, you might not need it.