I have a strange behaviour when I open the code-format-window. The font in the preview window is corrupt and when I switch to another application and back all buttons are invisible. They get visible again if I hover them with the mouse.
I switched the font in the options to "Consolas".
I am using Version 10.1 (10.1.0.119) on Windows 7, 64-bit.
Here's a screenshot:
