[xwiki-users] Attachment loss after restarting tomcat

Hello everybody, I think I do have a severe problem. I created a new wiki and enabled file system storage as described here: http://extensions.xwiki.org/xwiki/bin/view/Extension/Filesystem+Attachment+P... As described here (http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Attachments) I should be able to find the attachments in /usr/share/tomcat5.5/work/storage/xwiki/?. Unfortunately they are all saved in a temp directory: /usr/share/tomcat5.5/temp/work/storage/xwiki/Main/Test_for_upload/~this/attachments After restarting tomcat all attachments seem to be gone. What have I done wrong? Do I need to change anything in the tomcat configs? Any help is appreciated, Stephanie