I have installed the software but have an error 104 when I try to log in.

Error code 104 means that you can not access the Visual Nexus meeting server. The first thing to confirm is that you have the correct server address in your user profile (check the Visual Nexus Quick Start Guide to learn how to do this).  If the user profile is correct the problem may be because your network firewallis blocking access to the meeting server.  First check your network is working correctly by trying to browse the Internet. If that is working correctly yo can download and run the Visual Nexus Network Checker from the VNOnline download pages.  The Network Checker will tell you if access to the Visual Nexus meeting server is being blocked.

I can hear an echo of my voice when in a call.

Visual Nexus has an inbuilt echo canceller but this must be turned on when the audio wizard is used to set up the audio levels.  The audio wizard can be found in the endpoint configuration section of the Visual Nexus Meeting Manager.  If you can hear an echo of yourself during a call then one of the other participants in your meeting has not set echo cancellation correctly.  The easiest way to find out who is the "offender" is for each person on the call to mute their audio in turn and to listen for the echo tostop.  That person will then need to hang up from the call, select endpoint configuration and re-run the audio setup wizard with echo cancellation set.

I have put my video to full screen and can't return it to normal

To exit full screen mode you must first click on the video screen with your mouse (you may not be able to see the mouse pointer) and then hit the escape key.

I can see my contacts when I log in but can't make calls

The first thing to check is the color of the network status bars at the bottom of the Visual Nexus Meeting Manager.  If they are red then you are not fully connected.  This is usually caused by the connection to Visual Nexus Secure Transport being blocked.  If you have used the system without problems in the past, the cause is likely to have been an interruption in the network connection.  Exiting your Visual Nexus software and then restarting may solve the problem.  Another possible cause is that you are already logged in on another computer.  You can only log in one time to the system using your account.  If this is the first time you have tried to connect from this location, then it is possible that there is a firewall blocking the connection to the Secure Transport server, which is usually port 8081.  Check with your network administrator to see if access to this port is blocked.

I can make a call to a colleague, but my video is blank when I join a meeting.

Visual Nexus virtual meeting rooms are normally set for the best quality video codec (H.264).  Some less powerful computers can not support the processing power needed by this video codec.  You should re-run the video benchmarks in the endpoint configuration section of the Visual Nexus Meeting Manager to make sure you can support this codec.  In a person to person call the two endpoints negotiate the best possible video codec and if one computer can not support a video codec the video quality will automatically downgrade to one that it can support. Meeting rooms are always preset to a specific video codec.

I can't see a presentation that one of my colleagues is making ?

The most common cause for one of the meeting participants saying they can't see the presentation being shared is that they have their video image set to full screen.  When they are using the full screen for the video images, it hides the presentation behind the video image.  The solution is to return the video to a normal window.  Alternatively if you have dual monitors you can have the video on one screen and the presentation on the other.

How do I make a call to a video conferencing room system ?

You can call a video conferencing room system by its IP address.  Click on <Program> and select <call> in the Meeting Manager.  Next select the IP address button and then enter the IP address in the Destination field.  Finally click on call.