You probably need to upgrade FB to a newer Java version. See: http://blogs.adobe.com/flashplayer/2016/09/running-adobe-flash-builder-on-m ac-with-java-78.html#sthash.A7Gi2Th5.dpbs
You may also need to edit the .ini file and add: -Djava.util.Arrays.useLegacyMergeSort=true HTH, -Alex
