Looks like same problem like here -- https://bugs.launchpad.net/ubuntu/+source/libgnome/+bug/345189/ -- make you sure you have in System → Preferences → Appereance → Fonts set all fonts size to 10.
Looks like same problem like here -- https:/ /bugs.launchpad .net/ubuntu/ +source/ libgnome/ +bug/345189/ -- make you sure you have in System → Preferences → Appereance → Fonts set all fonts size to 10.