Hi, since I upgraded to 4.7.1 the preview seems completely broken. I read other posts saying about this problem for unpublished nodes. Well I have this problem for published ones... (ideas?):

Server Error in '/' Application.
No current Umbraco User registered in Preview
Parameter name: m_userId
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: No current Umbraco User registered in Preview
Parameter name: m_userId

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: No current Umbraco User registered in Preview
Parameter name: m_userId]
   umbraco.presentation.preview.PreviewContent.updatePreviewPaths(Guid previewSet, Boolean validate) +438
   umbraco.presentation.preview.PreviewContent..ctor(Guid previewSet) +48
   umbraco.presentation.UmbracoServerUtility.get_ContentXml() +400
   umbraco.Linq.Core.Node.NodeDataProvider.get_Xml() +58
   umbraco.Linq.Core.Node.NodeTree`1.GetEnumerator() +154
   System.Linq.WhereEnumerableIterator`1.MoveNext() +107
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +488
   System.Linq.<GetEnumerator>d__0.MoveNext() +146
   System.Linq.<TakeIterator>d__3a`1.MoveNext() +376
   System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) +696
   System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) +167
   EnergieSchweiz.usercontrols.lastEvents.Page_Load(Object sender, EventArgs e) +512
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3048


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1