3
1)If you can access you groups in system try to see your group to see if your name is still in the list in the bottom of the page. If it is try to update to see if this makes any difference.
2) again if you have access, turn on php debug in settings to see if showing any errors. Maybe some module is preventing reading your permissions
3) Maybe your database table grop permissions is damaged
Try REPAIR TABLE `xoops_group_permission`
in phpmyadmin and see if this makes any changes
Programming is like sex:
One mistake and you have to support it for the rest of your life.