Problem Access Control / Wireless Card Access List

[NGearUser]

We use the online Genie at routerlogin.net.

We use teh Wireless Card Access List to control which devices can access the internet and when. It's helpful for example so our child's game console or laptop can not access the internet overnight.

We used to be able to add, edit or delete but recently we can no longer add or edit. Hitting those buttons just brings up a blank screen. The AdvancedWirelessSettings.asp file should appear there in an iFrame.

We are the latest firmware version allowed by Comcast V3.01.22

We tried the Genie desktop app, but that does not have the Wireless Card Access List menu.

How do we get this functionality back? Is it possible to rollback the firmware?

[NGearUser]

PS: When we do get to that screen there is a warning like this...

http://[fxx0::ax2b:xxxx:fed9:xxxx] is requesting your username and password. WARNING: Your password will not be sent to the website you are currently visiting!

(I replaced some of the characters in the address for security reasons.) Don't know if this is related to the Add or Edit screens being blank. Not sure if this is Firefox saying "well, this is the router address, but it's not https so be careful" or something more malicious. That address does seem to connect to the router admin.

Thanks.

[NGearUser]

PSS: If I manually type in http://[fxx0::ax2b:xxxx:fed9:xxxx]/WirelessCardAccessList.asp I can get to that screen and use the Add / Edit functions.

Again, the URL was edited for security.

Why is this broken, how do we fix this?