I'm having issues with aligning superscript with subscript in math mode. My MWE is:
% arara: xelatex
\documentclass[preview,8pt,varwidth=true]{standalone}
\usepackage{amsmath}
\usepackage{mathspec}
\usepackage{fontspec}
\setmathfont(Greek,Digits,Latin){CMU Bright Roman}
\usepackage[normalweight=Light,largedelims=true]{mdsymbol}
\setmathrm[ItalicFont=CMU Bright Roman, BoldFont=CMU Bright Roman,BoldItalicFont=CMU Bright Roman]{CMU Bright Roman}
\begin{document}
\thispagestyle{empty}
$v_{\alpha\beta}^\star$
\end{document}
If you take a closer look, you'll see that the star is pushed to the left slightly.