Verizon 9100EM Router - ARP Table No Longer Working

I have the Westell 9100EM router from Verizon. The router allows to set static DHCP connections using a function called ARP Table (under Advanced menu). It actually used to work. However, when I attempted to add a new static connection today, ARP Tbale was no longer working. It shows connections that I set up in the past but does not allow to add any new connection or even to change anything.
Specifically, the ARP Table now has only three columns (IP Address, Physical Address, and Device). There used to be several additional columns (Lease Type, Connection Name, Status, and Action), which are now gone. The "Action" column had links from where one could change the setting. It also had the option "New Static Connection", which is now gone as well.
Any idea what the reason could be?
Thanks a lot.

It seems to me that the router's firmware (OS if you will) was upgraded OR downgraged.
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Verizon 9100EM Router - ARP Table No Longer Working

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