I too have noticed that now when at home and on the same network as the cameras, the mydlink site takes a good minute to connect. the image is 320x240 with a 60-second countdown timer -- just like when I try to connect from work. Before, when I was home, the connection was immediate, at 640x480 and there was no 60-second countdown.
The mydlink Lite app on my Android phone still works fine even though that too was recently updated (I updated my app yesterday). On my phone, when I have wi-fi enabled and I'm connected to my router at home, connection is instant. When connected via 3G, it takes about a minute to connect before I see the live video feed.
D-Link has obviously made some changes. Not sure if it's documented anywhere.