Navigraph Charts fail

I have Navigraph Charts on a separate PC linked via LAN to the PC running MSFS. Since the recent changes I have had issues during every flight whereby the chart is cleared from the screen and replaced by a blank white page when taxying in after landing. Task Manager shows the application is still running and it is still shwon on the Taskbar. The only resolution is to stop the application by cloosing the window and restart it. When restarted the maps are shown and only requires the ‘follow me’ option and ‘Vatsim’ options to be restarted to restore the situation.