Its not the browser, this is what I get in VPN now
Yet in the older firmware I could control devices.
for DNS Filter, now it's completely missing from the UI.
Also I'm having problems connecting to the router vis the DDNS server I get a browser error going via asuscomm.com. or its like very slow 20min to load in. yet IP address way when there works fine.
Going to do a Factory reset with Initialize ticked, and will get back to you.
I may swap to the Merlin firmware if its support by you's, as its a lot newer FW than you are posting, yet they get the main file from you, then add there merlin bits.