Cure You have not give access permission to all of the HGMP hosts in the list above. Set them all up and try again. It takes ages for some options to start up. The network is slow. The networks are generally heavily loaded in the afternoon, so while you are waiting for your computing department to improve the speed of your network connection, log onto the HGMP in the morning.
Some programs are slow.
Cure Be patient. Some programs just are plain slow. They could be poorly designed or written, or they could be acessing huge datasets. In addition to the simple xhost method described above , it's possible to use the basic X authentication mechanism to allow the HGMP computers to display windows on your screen. When you connect to the menu you are asked if you wish to use X-windows.