• login screen looks extremely ugly
  Login Dialog with 5.2.0.M5 (see login520.png picture)
  Login Dialog with 6.0.0.M6 (see login600.png)
  
• null pointer exception in AccessControlService.execLoadPermission() as the

  ServerSession seems to be null whenever user "notification-authenticator" is passed to the method, which is about every 10 seconds.
  Against this, we can easily guard ourselves, but it was unexpected
   null pointer exception because AbstractForm.getDesktop() seems to return null
  2016-03-23 16:35:43,386 ERROR scout-model-thread-23 t.c.s.c.a.s.c.ui.desktop.AngebotDesktopExtension - Exception while creating AngebotForms: null [u208490 @   ]
  java.lang.NullPointerException: null
  	at org.eclipse.scout.rt.client.ui.form.AbstractForm.startInternalExclusive(AbstractForm.java:827) ~[org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at ch.sbb.cisi.angebot.scout.client.ui.forms.DetailsZugForm.startModify(DetailsZugForm.java:1282) ~[angebot.scout.client-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
  	at ch.sbb.cisi.angebot.scout.client.ui.desktop.AngebotDesktopExtension.execInit(AngebotDesktopExtension.java:321) ~[angebot.scout.client-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
  	at org.eclipse.scout.rt.client.ui.desktop.AbstractDesktopExtension.initDelegate(AbstractDesktopExtension.java:43) [org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.client.ui.desktop.AbstractDesktop.initDesktop(AbstractDesktop.java:636) [org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.client.AbstractClientSession.setDesktop(AbstractClientSession.java:409) [org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at ch.sbb.cisi.core.client.CoreClientSession.execLoadSession(CoreClientSession.java:69) [core.scout.client-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]

  
  
• null pointer exception because it seems that Desktop.getTitle() is called, before our DesktopExtension.desktopOpenDelegate() is called to set it, so getTitle() returns null. We can fix this easily enough, by setting this to an empty string in our Desktop-constructor, but it is not something that failed before
  

  2016-03-23 16:47:38,453 ERROR scout-model-thread-22 o.e.scout.rt.platform.exception.ExceptionHandler - NullPointerException:n/a [u208490 @   ]
  java.lang.NullPointerException: null
  	at java.lang.StringBuilder.<init>(StringBuilder.java:109) ~[na:1.7.0_67]
  	at org.eclipse.scout.rt.client.deeplink.DeepLinkUriBuilder.createBrowserHistoryEntry(DeepLinkUriBuilder.java:68) ~[org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.client.deeplink.OutlineHandler.createBrowserHistoryEntry(OutlineHandler.java:53) ~[org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.client.ui.desktop.AbstractDesktop.setOutlineInternal(AbstractDesktop.java:1004) ~[org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.client.ui.desktop.AbstractDesktop$3.run(AbstractDesktop.java:973) ~[org.eclipse.scout.rt.client-6.0.0.M6.jar:6.0.0.M6]
  

  
  
• some new error about there not being an adapter for our outline which worked until then
  

  2016-03-23 16:47:38,540 WARN  scout-model-thread-23 org.eclipse.scout.rt.ui.html.UiSession - Error while transforming response to JSON: JsonResponse [STARTUP RESPONSE, adapters: 53, events: 5, buffered events adapters: 0] [u208490 @   ]
  java.lang.IllegalArgumentException: No adapter registered for model=ch.sbb.cisi.angebot.scout.client.ui.desktop.outlines.AngebotOutline@1b5babd
  	at org.eclipse.scout.rt.ui.html.json.JsonAdapterUtility.getAdapterIdForModel(JsonAdapterUtility.java:42) ~[org.eclipse.scout.rt.ui.html-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.ui.html.json.JsonAdapterUtility.getAdapterIdForModel(JsonAdapterUtility.java:29) ~[org.eclipse.scout.rt.ui.html-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.ui.html.json.AbstractJsonAdapter.putAdapterIdProperty(AbstractJsonAdapter.java:284) ~[org.eclipse.scout.rt.ui.html-6.0.0.M6.jar:6.0.0.M6]
  	at org.eclipse.scout.rt.ui.html.json.desktop.JsonDesktop.toJson(JsonDesktop.java:259) ~[org.eclipse.scout.rt.ui.html-6.0.0.M6.jar:6.0.0.M6]

  
  

I was surprised to find that it was already available, so it seems I was notified too early and got myself a pre-release Am I right in expecting that M6_1 should avoid most of the trouble I encountered with M6?