[xwiki-users] A blog entry has disappear (xwiki enterprise 1.7.2)

Hello,  I have a document created in the blog that has disappears (it happened when we were still in 1.6, after the upgrade to 1.7.2 the problem is still there). I can't understand why... what rule is following the blog macro to choose which document has to appear ? The record is still there in database and I can access the document with the search function. By the way, how is the XWD_ID created and why does it has sometimes a negative value ? Here is my entry in the xwikidoc table (sorry for the format...) XWD_ID              XWD_FULLNAME            XWD_NAME      XWD_TITLE        XWD_LANGUAGE           XWD_DEFAULT_LANGUAGE                XWD_TRANSLATION     XWD_DATE        XWD_CONTENT_UPDATE_DATE             XWD_CREATION_DATE                XWD_AUTHOR XWD_CONTENT_AUTHOR          XWD_CREATOR               XWD_WEB         XWD_CONTENT                XWD_VERSION                XWD_CUSTOM_CLASS XWD_PARENT  XWD_CLASS_XML          XWD_ELEMENTS                XWD_DEFAULT_TEMPLATE        XWD_VALIDATION_SCRIPT        XWD_COMMENT            XWD_MINOREDIT                XWD_SYNTAX_ID           XWD_HIDDEN -1031415417      Blog.SlidesSeminaireIntegration              SlidesSeminaireIntegration                                       fr            0             2009-03-05 16:48:56.0               2009-03-05 16:48:56.0    2009-03-05 16:44:50.0    XWiki.nfrank     XWiki.nfrank     XWiki.nfrank     Blog                #includeForm("XWiki.ArticleClassSheet")           4.1                         Main.WebHome             <null>   3                                                            false      xwiki/1.0             false Thank's a lot. Nicolas Frank