Joomla 2.5 Can’t Change Menu Item Order

The menu ordering problem should be fixed. For details on this, see the following Joomla Forum Post:

http://forum.joomla.org/viewtopic.php?f=579&t=636152&sid=f77df8ad9cb239d539974be5d5e1424c&start=30#p2782177

Also see How to change the order of Joomla menu links.