cannot access xr500 router

Hello, 

 

I just installed my xr500 router, which runs to a Arris DOCSIS 3.0 cable modem. 

I am online (clearly) but I cannot access the router's GUI. 

 

I tried 192.168.1.1 -  I tried www.routerlogin.com - all that happens is I get a blank white screen after I enter my credentials.. 

Actually, only the URL even prompts me for my credentials.... 

 

As I am typing this, I was trying to log in. I made "progress". Now it just stops at an all red screen. 
I tried clearing DNS, clearing browsing cache, i tried starting my browser, and the router's firmware is up-to-date. 

 

I now tried to reload the URL.. and I'm right back to the all white screen.. 

*I thought this was supposed to be the next 'top gun' router :/ 
So far, $300 not well spend. Please help. 

Regards.