[xwiki-users] Content and diff field are contradicting

hello, I run xwiki 1.9 and I have multiple problems : * When I edit part of a page, only that part is kept and the rest is lost * When I edit a page, i lost the history (only SuperAdmin can view and restore from the history) * WhatsNew doesn't display modification All this error appears since the upgrade to 1.9 version In my log, 2 lines are repeated : * [WARNING] Deprecated usage of getter [com.xpn.xwiki.api.Document.getWeb] * WARN rcs.XWikiPatch - isDiff: Patch is inconsistent. Content and diff field are contradicting My installation of xwiki is very very old. I maintain the same bdd (mysql) since the version 0.7 (and older yet, I think). Early June, I updated from 1.2 to 1.8 and few days later, 1.8 to 1.9. Any help would be greatly appreciated. Thank you very much, Johan