Hi! I recently installed the MacTex 2011 distribution and has been trying to typeset some chemical formulas using ConTeXt MKIV (i.e. via ConTeXt (LuaTeX) engine of TeXShop). However, if I try to typeset the following \startformula \chemical{Na^+,+,Cl^-,GIVES,NaCl} \stopformula I get Na+ + Cl— GIVES NaCl (Note: The superscript "+" and "—" of the ions were correctly displayed.) But if I use \chemical{GIVES} under the \startchemical \stopchemical environment, I am able to get the left arrow that it's supposed to produce in the chemical formula environment. I know that the chemic module is already integrated in the ConTeXt MKIV but I just can't seem to do chemical typesetting the way I used to using the 2010 MacTeX distribution. Any help would be greatly appreciated. Thanks. joel mendoza