With no change of settings by me, my Mathematica has starting giving an error when I try to enter expressions like fractions or exponents with the keyboard (ctrl+slash, ctrl+^, for example). The error is:
"You cannot insert an inline cell into this cell because the option AllowInlineCells is set to False."
If I attempt to enter those expressions with buttons on the Basic Input palette, I get things like this:
Where those question marks are, I can place the numerator and denominator quantities (they're the Mathematica "boxes"), for the fraction expression, for example.
So I have check my settings, and contrary to the error message, my AllowInlineCells is set to true.
Has anyone seen this irrational problem before? Thank you,