I'm pretty certain the issue exists in previous versions too.

Steps to reproduce:

• Create a template with a "File" field in it (among other things)

• Create an item with that template - assign proper presentation details.

• Create an Edit Frame, and assign the "File" field to it (File fields are not directly editable in Experience editor so we need either a custom edit button or an edit frame. Behaviour is the same in both cases).

• Open the Edit frame and try to assign a value to the File field (try to select a media item by clicking on "Open File").

• You get an error:

Exception: System.Web.HttpUnhandledException
Message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Source: System.Web
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Nested Exception

Exception: System.Reflection.TargetInvocationException
Message: Exception has been thrown by the target of an invocation.
Source: mscorlib
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj)
   at Sitecore.Nexus.Pipelines.NexusPipelineApi.Resume(PipelineArgs args, Pipeline pipeline)
   at Sitecore.Pipelines.Pipeline.Start(PipelineArgs args, Boolean atomic)
   at Sitecore.Web.UI.Sheer.ClientPage.RunPipelines()
   at Sitecore.Web.UI.Sheer.ClientPage.OnPreRender(EventArgs e)
   at Sitecore.Shell.Applications.ContentManager.FieldEditorPage.OnPreRender(EventArgs e)
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Nested Exception

Exception: System.ArgumentNullException
Message: Value cannot be null.
Parameter name: name
Source: Sitecore.Kernel
   at Sitecore.Diagnostics.Assert.ArgumentNotNull(Object argument, String argumentName)
   at Sitecore.Globalization.Language.Parse(String name)
   at Sitecore.Shell.Applications.ContentEditor.File.OpenFile(ClientPipelineArgs args)

Anyone know how to work around this?