I think this happens because I use a “Custom URL” to update my DDNS #1 DDNS name but this issue can easily be reproduced. Whenever the WAN IP changes and the DDNS servers are auto-updated, most of the page, after the DDNS #1 “Last Result” and including the “Save” & “Cancel” buttons, disappears (is re-displayed blank). The same is true if I check the “Force next update” checkbox against DDNS #1. A forced update of only DDNS #2 does not yield the same results - ie. the page is re-displayed correctly. I believe, however, that all updates are always successfully applied. This issue is minor because the fix is simply to reboot the router. As far as I can see, that’s the only way to get the entire page back. I tested with Firefox v29 & IE v11. Both are similarly affected. See the screenshots below. After DDNS updates After router reboot I am currently using “Tomato Firmware v1.28.7505 MIPSR2Toastman-RT K26 USB VPN” but I think I recall noticing this on previous builds too. I only use Toastman Tomato so I don’t know whether other Tomato flavours are affected. The format of the “Custom URL” I use is below. "http://<User>:<Password>@members.dh...&hostname=<DDNSname>&updatetype=Online&ip=@IP". It is quite long (@>170 characters) and the <> symbols are placeholders for real values so I don’t give away my details! It has, however, worked fine like this for 2+ years.