Hello, when I edit a page template or a dtml method with ExternalEditor I get the following errors: ------ Traceback (innermost last): Module ZPublisher.Publish, line 126, in publish Module ZPublisher.mapply, line 77, in mapply Module ZPublisher.Publish, line 46, in call_object Module Products.PageTemplates.ZopePageTemplate, line 351, in PUT Module webdav.Resource, line 175, in dav__simpleifhandler AttributeError: 'NoneType' object has no attribute 'refresh' ------ Traceback (innermost last): Module ZPublisher.Publish, line 126, in publish Module ZPublisher.mapply, line 77, in mapply Module ZPublisher.Publish, line 46, in call_object Module OFS.DTMLMethod, line 378, in PUT Module webdav.Resource, line 179, in dav__simpleifhandler PreconditionFailed: Condition failed. ----- Please notice the error happen when I try to save the documents after more or less 10 minutes since the last save. No error happen If I save the document after a minute or two since I opened it. Zope Version (2.13.12, python 2.7.1, linux2) Python Version 2.7.1 (r271:86832, Sep 13 2011, 19:13:17) [GCC 4.4.4 20100726 (Red Hat 4.4.4-13)] ExternalEditor-1.1.0 ZopeEditManager 0.9.7 Mac osx Can someone help me up with this issue? Best regards, Giampiero