Mac Address filtering isn't working on XB7 Gateway

I just received the new gateway XB7 from xfinity, I was previously on the XB6 with no problems.  But now I'm having issues with my setup:

• After activation, I logged into the XB7 device web page and added MAC addresses to the 2.4 GHz SSID, and the 5 GHz SSID lists in the Gateway->Connection->Wi-Fi MAC Address Filter setting page. 
• I then set the MAC filtering mode on both to ALLOW. 
• I then tried to log in and was not able to log in with any of the devices in the lists for either SSID
• It does not allow any device NOT IN THE LIST from connecting, but during the attempt prompts for a password, then denies
• Devices ON THE LIST are immediately denied access though.  No password prompt
• Just for a sanity check, I set the MAC filtering mode to DENY.  That works and does allow devices not in the list to connect, but rather worthless for my preferred application
• I also tried a hard reset/restore to the device default settings, no luck
• As indicated, our previous gateway never had this problem

I know it's probably trivial and with WPA2-PSK (AES) probably not needed, but I like the second level of security along with a nice long password

Any ideas are appreciated OR any alternative security methods - Thanks!