I've just installed a clean 4.7.1 site.

I can create folders and files in the media library but when i create an image i get the following error after naming it. When reloading the folder the image has been created in the tree, but clicking it also returns the following error:

Server Error in '/' Application.
Object reference not set to an instance of an object.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.NullReferenceException: Object reference not set to an instance of an object.

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: 

[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.editorControls.imagecropper.DataEditor.OnInit(EventArgs e) +554
   System.Web.UI.Control.InitRecursive(Control namingContainer) +140
   System.Web.UI.Control.InitRecursive(Control namingContainer) +311
   System.Web.UI.Control.InitRecursive(Control namingContainer) +311
   System.Web.UI.Control.InitRecursive(Control namingContainer) +311
   System.Web.UI.Control.InitRecursive(Control namingContainer) +311
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +197
   System.Web.UI.ControlCollection.Add(Control child) +79
   umbraco.controls.ContentControl.addControlNew(Property p, TabPage tp, String Caption) +3680
   umbraco.controls.ContentControl.CreateChildControls() +609
   System.Web.UI.Control.EnsureChildControls() +102
   umbraco.controls.ContentControl.OnInit(EventArgs e) +32
   System.Web.UI.Control.InitRecursive(Control namingContainer) +140
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +197
   System.Web.UI.ControlCollection.Add(Control child) +79
   umbraco.cms.presentation.editMedia.OnInit(EventArgs e) +502
   System.Web.UI.Control.InitRecursive(Control namingContainer) +140
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +480








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

Any help appriciated