Remote viewing problem

After some new equipment was installed we are unable to remotely view security cameras from the DVR.
Via local network they are visible. When attempting to connect remotely, a login page appears .. This didn't before as it went straight to the image viewing. Now even after logging in all we get is a blank screen with a left column showing the individual cameras. Clicking on those does not bring up an image.
Can post pics of settings if needed.
Thanks for any help.