Hi there, it seems that there is some minor bug with the text size in the string identifying the item being clocked in the mode-line. Here's a minimal example showing the problem (tested with emacs -Q, GNU Emacs 25.0.50.1 (i686-pc-linux-gnu, GTK+ Version 3.10.8) of 2015-01-02):
M-: (set-face-attribute 'mode-line nil :height 0.8333) visit an Org file and start clocking the part saying what is clocked is smaller than the rest of the mode-line. Best, -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Faculty of Mathematics and Computer Science Adam Mickiewicz University