Shortcut keys for changing font size

When I try Ctrl+< or Ctrl+> to change font size, I get either the project statistics window or project goal window. When I try Ctrl+Shift+< or Ctrl+Shift+>, nothing happens. What am I missing?
Thanks.

These should be working (the ones with the Shift keys). If I select some text and press Ctrl-Shift-< it decreases in size, one point at a time. Does anything happen if you use the Format/Font/Smaller menu command?