IDE 1.6 crashes when I have a Bluetooth mouse connected to the computer with:
Exception in thread "main" java.lang.UnsatisfiedLinkError: jssc.SerialNativeInterface.getSerialPortNames()[Ljava/lang/String;
at jssc.SerialNativeInterface.getSerialPortNames(Native Method)
at processing.app.SerialPortList.getWindowsPortNames(Unknown Source)
at processing.app.SerialPortList.getPortNames(Unknown Source)
at processing.app.SerialPortList.getPortNames(Unknown Source)
at processing.app.Serial.list(Unknown Source)
at cc.arduino.packages.discoverers.SerialDiscovery.discovery(Unknown Source)
at cc.arduino.packages.DiscoveryManager.discovery(Unknown Source)
at processing.app.Editor.populatePortMenu(Editor.java:998)
at processing.app.Editor.buildToolsMenu(Editor.java:720)
at processing.app.Editor.buildMenuBar(Editor.java:488)
at processing.app.Editor.(Editor.java:215)
at processing.app.Base.handleOpen(Base.java:727)
at processing.app.Base.handleOpen(Base.java:692)
at processing.app.Base.handleNew(Base.java:595)
at processing.app.Base.(Base.java:297)
at processing.app.Base.main(Base.java:166)

see also:
http://forum.arduino.cc/index.php?topic=299211.75
http://forum.arduino.cc/index.php?topic=299211.120

Bluetooth mouse used to be an issue already in IDE 1.0.5, see related postings and solution:
http://forum.arduino.cc/index.php?topic=46977.0
http://forum.arduino.cc/index.php?topic=141797.0

rxtxSerial.dll was replaced with JSSC. Did it bring back a Bluetooth bug ?
Possible solution: (I have not try this yet, I also guess it could be refined)
https://alselectro.wordpress.com/2014/01/26/arduinosolution-to-launch4j-problem/

Michael