Greetings!
Why does my CS6 units & measurements show comma for decimal symbol? I expected it to be a dot. After reading elsewhere on the Internet, I made sure that my system preferences are set to English. See screen shots below.
Mac (10.8.2) > System Preferences > Region setting
InDesign CS6 (example: see the value in the Width field; it show "8,5 in" instead of "8.5 in".)