It was doing fine up to b03 included.
Starting with b04 and still with b05 the FXMLLoader isn't able to load at least one of the FXML files SceneBuilder is made of.

Exception in Application start method
loader.getController()=com.oracle.javafx.scenebuilder.app.info.InfoPanelController@ad581bf
loader.getLocation()=file:/Users/yjoan/designertool/2.0/using8u20/scenebuilder/SceneBuilderApp/build/classes/com/oracle/javafx/scenebuilder/app/info/InfoPanel.fxml
loader.getController()=com.oracle.javafx.scenebuilder.app.DocumentWindowController@477a6b9b
loader.getLocation()=file:/Users/yjoan/designertool/2.0/using8u20/scenebuilder/SceneBuilderApp/build/classes/com/oracle/javafx/scenebuilder/app/DocumentWindow.fxml
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:367)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:305)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:894)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.RuntimeException: Failed to load /Users/yjoan/designertool/2.0/using8u20/scenebuilder/SceneBuilderApp/build/classes/com/oracle/javafx/scenebuilder/app/DocumentWindow.fxml
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractFxmlWindowController.makeRoot(AbstractFxmlWindowController.java:114)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractWindowController.getRoot(AbstractWindowController.java:91)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractWindowController.getScene(AbstractWindowController.java:111)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractWindowController.getStage(AbstractWindowController.java:134)
    at com.oracle.javafx.scenebuilder.app.DocumentWindowController.openWindow(DocumentWindowController.java:1088)
    at com.oracle.javafx.scenebuilder.app.SceneBuilderApp.handleLaunch(SceneBuilderApp.java:419)
    at com.oracle.javafx.scenebuilder.app.AppPlatform.requestStartMac(AppPlatform.java:217)
    at com.oracle.javafx.scenebuilder.app.AppPlatform.requestStart(AppPlatform.java:99)
    at com.oracle.javafx.scenebuilder.app.SceneBuilderApp.start(SceneBuilderApp.java:372)
    at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
    at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
Caused by: java.lang.RuntimeException: Failed to load /Users/yjoan/designertool/2.0/using8u20/scenebuilder/SceneBuilderApp/build/classes/com/oracle/javafx/scenebuilder/app/info/InfoPanel.fxml
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractFxmlPanelController.makePanel(AbstractFxmlPanelController.java:93)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractPanelController.getPanelRoot(AbstractPanelController.java:130)
    at com.oracle.javafx.scenebuilder.app.DocumentWindowController.controllerDidLoadFxml(DocumentWindowController.java:985)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractFxmlWindowController.makeRoot(AbstractFxmlWindowController.java:110)
    ... 15 more
Caused by: java.lang.RuntimeException: Failed to load file:/Users/yjoan/designertool/2.0/using8u20/scenebuilder/SceneBuilderKit/dist/SceneBuilderKit.jar!/com/oracle/javafx/scenebuilder/kit/editor/panel/inspector/editors/StringAutoSuggestEditor.fxml
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.EditorUtils.loadFxml(EditorUtils.java:483)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.EditorUtils.loadFxml(EditorUtils.java:463)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.AutoSuggestEditor.preInit(AutoSuggestEditor.java:124)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.AutoSuggestEditor.<init>(AutoSuggestEditor.java:118)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.AutoSuggestEditor.<init>(AutoSuggestEditor.java:103)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.ControllerClassEditor.<init>(ControllerClassEditor.java:51)
    at com.oracle.javafx.scenebuilder.app.info.InfoPanelController.performInitialization(InfoPanelController.java:187)
    at com.oracle.javafx.scenebuilder.app.info.InfoPanelController.controllerDidLoadFxml(InfoPanelController.java:174)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.util.AbstractFxmlPanelController.makePanel(AbstractFxmlPanelController.java:89)
    ... 18 more
Caused by: javafx.fxml.LoadException:
file:/Users/yjoan/designertool/2.0/using8u20/scenebuilder/SceneBuilderKit/dist/SceneBuilderKit.jar!/com/oracle/javafx/scenebuilder/kit/editor/panel/inspector/editors/StringAutoSuggestEditor.fxml

    at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2593)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2563)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2433)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2401)
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.EditorUtils.loadFxml(EditorUtils.java:481)
    ... 26 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2558)
    ... 29 more
Caused by: java.lang.NullPointerException
    at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.AutoSuggestEditor.initialize(AutoSuggestEditor.java:142)
    ... 39 more
Exception running application com.oracle.javafx.scenebuilder.app.SceneBuilderApp
Java Result: 1