[XeTeX] RotatedGlyphs vs. microtype

[Juan Acevedo]

Dear all

I wonder if someone can think of a way to make it possible to use microtype and have at the same time one word with rotated glyphs. The minimal example below runs fine unless you uncomment microtype. 

I have tried temporarily disabling microtype using
\microtypesetup{protrusion=false,expansion=false}
then switching it on again after the offending rotation, but it does not work. Compilation stops with the message:
! Missing number, treated as zero.
<to be read again> 
                   U


Thanks in advance,
Juan
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%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode
\documentclass{article}
\usepackage{fontspec}\setromanfont{Arial}
\usepackage{graphicx}
%\usepackage{microtype}
\begin{document}
Testing here
{\fontspec[Renderer=AAT,Vertical=RotatedGlyphs]{Arial} {vertically}}
\end{document} 

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