When I hit the 'Insert image' button in the rich text editor bar, the modal opens but then an error page appears:
Details of exception: System.NullReferenceException: Object reference not set to an instance of an object
Stacktrace:
[NullReferenceException: De objectverwijzing is niet op een exemplaar van een object ingesteld.]
umbraco.controls.Images.ImageViewer.OnPreRender(EventArgs e) +70
System.Web.UI.Control.PreRenderRecursiveInternal() +83
System.Web.UI.Control.PreRenderRecursiveInternal() +168
System.Web.UI.Control.PreRenderRecursiveInternal() +168
System.Web.UI.Control.PreRenderRecursiveInternal() +168
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +974
Versiondata: Microsoft .NET Framework Versie:4.0.30319; ASP.NET Versie:4.0.30319.17929
Running Umbraco 6.1.3 on localhost and on server, both give the error. I have already tried to replace the umbraco.dll and umbraco.editorControls.dll with fresh ones, but to no avail. I also checked all my datatypes, but none are corrupt (as per Rich Text Editor and Inserting Images getting error and http://our.umbraco.org/forum/using/ui-questions/39103-Problem-with-Rich-Text-Editor-and-Inserting-Images). I am using uComponents, but I have the most recent version (5.5.0)