My Mathematica (v. 10.2) insists on italicizing single characters in text cells, including title cells, section cells, etc. See the "a" in "Define a rotation..." below for an example,
I've changed the notebook stylesheet (to the Mathematica Journal stylesheet) to no avail. Selecting the cell and clearing the formatting using the Classroom Assistant palette changes nothing. I'm really stumped. How do I stop Mathematica from doing this?
Edit: I found that using the button on the Classroom Assistant palette to generate a text cell gives one that behaves as I want. Here’s an example:
Cell["hello", "Text"]
But using the Alt-7 key shortcut makes a text cell like this
Cell[BoxData[ FormBox["hello", TraditionalForm]], "Text"]
which is the kind of cell that creates the problem.
Is there a way to change the Alt-7 shortcut to insert a simple text cell, as above?

SingleLetterItalicstoFalseand you still get this behavior? – Mr.Wizard Dec 01 '16 at 23:29aas a variable somewhere else? – David G. Stork Dec 01 '16 at 23:59SingleLetterItalicstoFalsein that dialog fixes the problem for that cell. Selecting "Global Preferences" in the Show option values dropdown showsFalse, but new cells still have the option set toFalse. Is there a way to do this globally? – Rodney Price Dec 02 '16 at 00:06Cell[BoxData[ FormBox[ RowBox[{"Define", " ", "a", " ", "rotation"}], TraditionalForm]], "Text",....aisn't defined anywhere else. This behavior occurs anytime I type a single letter. – Rodney Price Dec 02 '16 at 00:17"Define a rotation"instead of"Define", " ", "a", " ", "rotation"? – David G. Stork Dec 02 '16 at 01:05