Hi Lars! What is your exact configuration of the Client and Server? What version of the VisualSVN Server do you use? What svn client (what version) do you use?
Could you please send us the VisualSVN Server logs? VisualSVN Server writes log to the Windows Event Log. You could find VisualSVN Server logs in the Application category in the Event Viewer. Thank you! -- Regards, Olga Dolidze VisualSVN Support