[xwiki-users] Group Management

Hey everybody, We recently upgraded our company's XWiki from version 1.2 to 1.8. To keep the migration as comfortable as possible for our users (and to save some work), we decided to export not only the contents but also the user accounts and rights settings (i.e. the whole 'XWiki' space) of the old version, and import them into the new version. Doing so brought up a problem we couldn't solve: After importing the XWiki.xar, it is impossible to change the group settings (edit group members...) using the dialog that opens when clicking the 'edit' symbol (the pen on the right). Instead, we have to use the 'edit objects' functionality to manually edit the group members. Moreover, creating a new group using the 'add new group' dialog, the newly created group exists, but doesn't show up in the list of groups as long as it hasn't got any members. Does anyone of you know how to solve that problem? Any help would be appreciated. Best regards, Sascha