R7900 update V1.0.1.18_10.0.20. cannot connect to Netgear genie

I'm having the same problem with a newly installed R7900 replacing a WNDR4500 that bit the dust. Initial setup was not what I would consider smooth (e.g. www.routerlogin.net not being found by any web browser on a PC hardwired to the router, no Internet found via a modem verified to be connected to the Internet, etc.), BUT Genie via iPhone had been working along the way. Registering the router ended up pushing a firmware update to the R7900 seemingly automatically, at which point I believe is when Genie stopped working. After doing reinstalls of Genie S/W on both an iPhone and 2 different PC's, including a power-cycle of the router, Genie was able to log in once via iPhone, and then not anymore after that single shot.

Not that Genie is needed for doing more critical router configuration, it had been a handy tool in some instances.