CS6 New Document - Units and Increments - Ruler Units Defaulting Back to Picas

[vorststudio]

After setting the Units and Increments prefs to inches, InDesign defaults back to picas when creating a new document. Any suggestions? Should I rebuild my prefs? Or should I just give up and revert to my conversion chart from school?

[Peter Spier]

Make the change with no files open.