Hi Massimo I had a go at building rxtx. downloaded done ./configure; make; sudo make install; without problems I copy the new library to the Arduino folder and now the app launches (which is good news

) The problem I get now is that I try to run serial_write_basic for instance and get the following error..
Error inside Serial.<init>()
gnu.io.PortInUseException: Unknown Application
at gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:354)
at processing.app.Serial.<init>(Serial.java:127)
at processing.app.Serial.<init>(Serial.java:72)
at processing.app.Uploader.downloadJava(Uploader.java:130)
at processing.app.Sketch.upload(Sketch.java:1570)
at processing.app.Sketch.exportApplet(Sketch.java:1629)
at processing.app.Editor.handleExport(Editor.java:1724)
at processing.app.EditorButtons.mouseReleased(EditorButtons.java:343)
at java.awt.Component.processMouseEvent(Component.java:5166)
at java.awt.Component.processEvent(Component.java:4963)
at java.awt.Container.processEvent(Container.java:1613)
at java.awt.Component.dispatchEventImpl(Component.java:3681)
at java.awt.Container.dispatchEventImpl(Container.java:1671)
at java.awt.Component.dispatchEvent(Component.java:3543)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3527)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3242)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3172)
at java.awt.Container.dispatchEventImpl(Container.java:1657)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3543)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:480)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:170)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
[VP 1] Device is not responding correctly.
BTW I have also tried with the serial library in prcessing 0111 which claims to be universal binary and it doesn't work either I get the same error. :-/