Right click on a server hangs PA Server Monitor

Hi there, One of our servers (one fed from a satellite) is unable to be right clicked in the application. Left clicking it shows the graphs and monitors, but right clicking it (to bring up the context menu) completely hangs the application. The only remedy is to "end task" it in the task manager. Is there a way to remove this server from the list without needing to right click it? Is there any way to disgnose what's causing this issue? Thanks.