This appears to have been fixed in a recent update. Marking as fixed
released.
** Changed in: openoffice.org (Ubuntu)
Status: New = Fix Released
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Superscript/Subscript buttons have no effect
https://bugs.launchpad.net/bugs/135783
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I can can confirm this on Gutsy on a Lenovo 3000 N100 (which has been
upgraded). It seems also affect the right click menu on text (right
click -- Style -- Superscript/Subscript), as well as tool bar buttons
(but still works via Format -- Character... method) across all
OpenOffice.org