Hi again, Curiously the screen sharing/recording application wasn't working anymore. I played on the same server with the SVN version of OM and the last stable one, and finally, the screen sharing module wasn't working anymore complaining at startup that "JAR resources in the JNLP file are not signed by the same certificate".
In case this occurs to you, just clear your Java Cache: Control Panel > Java > button "Settings ..." > button "delete files ..." Hope this may help someone int he future ;-), Thibault