Are you able to see video (cams) when logged in locally to your network? Or are you getting greys no matter where you login?
If you are able to logg in but are seeing a gray picture instead of cams, It could be a graphics cards driver. I had this issue awhile ago.
Be sure to change to "prompt" the "download unsigned ActiveX controls. in the browser under internet options.
Also be sure your DVR info matches your routers info. This includes media port-port forwarding.
No everthing works fine on the local lan - Just grayed out when i log in from my dyndns account. I will check the active x prompts. When I first logged in it said it needed to run them I let it run the active x but just gray camera boxes