Which version of xoops do you use?
2.0.14/15/16 have a bug.
how to fix.
http://xoops.peak.ne.jp/md/news/index.php?page=article&storyid=354Anyway I recommend all Xoopsers to user 2.0.16a-JP from xoopscube.org.
(Just overwrite)
This is the real stable version guaranteed to be upgraded to the next revolutional versions by minahito.