GNOME Bugzilla – Bug 639086
Missing Icons
Last modified: 2011-01-09 22:49:30 UTC
On the long format toolbar there are two icons for sub and superscripts. At least in current ubuntu with all themes those icons are shown as "generic icons".
It looks like tose icons were in the Gnome 2.18 icon pack.
This problem has been fixed in the development version. The fix will be available in the next major software release. Thank you for your bug report.