We just clean install the new 4.0.1 this morning and we can see this in the 
openmeetings.log

ERROR 12-11 10:21:09.343 o.a.o.w.r.VideoSettings:97 [0.0-5443-exec-7] - Error 
while constructing video settings parameters
java.net.MalformedURLException: no protocol: undefined/openmeetings/screenshare
        at java.net.URL.<init>(URL.java:593)
        at java.net.URL.<init>(URL.java:490)
        at java.net.URL.<init>(URL.java:439)
        at 
org.apache.openmeetings.web.room.VideoSettings.getInitJson(VideoSettings.java:84)
        at 
org.apache.openmeetings.web.room.RoomPanel$1.respond(RoomPanel.java:138)
        at 
org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:598)
        at 
org.apache.wicket.core.request.handler.ListenerRequestHandler.internalInvoke(ListenerRequestHandler.java:306)
        at 
org.apache.wicket.core.request.handler.ListenerRequestHandler.invoke(ListenerRequestHandler.java:280)

First time we have that error.
The message appear when a user enter a room.

We also can see that other error when entering the OpenMeetings web interface 
and leave (QUIT)

ERROR 12-11 10:23:43.726 o.a.c.c.C.[.[.0.0.0.[.[default]:182 [0.0-5443-exec-2] 
- Servlet.service() for servlet [default] in context with path [/openmeetings] 
threw exception [Filter execution threw an exception] with root cause
java.lang.NoClassDefFoundError: Could not initialize class 
sun.awt.X11GraphicsEnvironment
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:264)


thank's to help

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