EA6500 router password stop working when on Internet

Question

My issue is pretty simple but really hard to understand on a logic standpoint.
I have a new EA6500 (v1), I hooked it up to the network and set it up using the default router password which is "admin". I set up the PPPOE connection for my internet and then, as soon as it is connected to the internet, I'm not able to connect to 192.168.1.1 anymore because it says my router password is invalid. If I just unplug the WAN cable and refresh it, the router password now works.
I tried changing it and it keeps working only if the router is not connected to internet. When it is connected to internet, I click the "local access mode" but get the same "invalid router password" error. If I connect using my Smart Wi-Fi account, I get a "error_gets_network" error that disappears after ~1sec and then it goes back to connection page, or sometimes it will just ask for the router password which won't work anyway.
I have the latest firmware but I still manually reinstalled it without any success. I tried a few hard resets too but the problem is still here and it is really annoying since I can't go to the router settings without unplugging the WAN cable from the router. And I can't link my smart Wifi account either obviously since the router password isn't recognized anymore if I'm on internet.
Any ideas??
I tried with latest version of Google Chrome (cleared cache and everything, and since it's working when the router is not plugged to internet, I don't think it's a browser problem). The interface doesn't work at all with latest IE version (even in compatibility mode, the interface keeps telling me to download the latest version of IE, that's really ironic).
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Answer 1

Try Opera or FF? If IE 8, 9, 10 or 11, set compatibility mode and test again.
Disable any security browser Add-ons like No Script and Ad-Block or configure them to allow All Pages when connected to the router.
Clear all browser caches.
Be sure to log into the Admin account on the router.
Try turning off these features in Chrome:
Top right corner, little bars for options > Settings > Settings (on left) > Show advanced settings.
Uncheck these:
Use a web service to help resolve navigation errors
Use a prediction service to help complete searches and URLs typed in the address bar
Predict network actions to improve page load performance
Enable phishing and malware protection