Nothing will compile

I run MikTeX 2.9 on Win10, everything kept up to date with the Update 
(Admin) function.  Something has happened recently -- I don't know what 
-- and files that used to compile perfectly no longer work.  They do 
work on another computer I have with the same MikTeX setup.

When I try to typeset this:

*****
% !TEX TS-program = xelatex
% !TEX encoding = UTF-8

\documentclass[12pt]{article}

\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}

\setmainfont{Cardo}

\begin{document}

\noindent A little bit of text here; nothing special.\\
And another line here. \\
\addfontfeature{Numbers=OldStyle}0123456789

\end{document}
*****

I get this error message:

*****
) 
(C:\Users\User\AppData\Roaming\MiKTeX\2.9\tex\latex\metalogo\metalogo.sty))
! Undefined control sequence.
<argument> \xetex_suppressfontnotfounderror:D

l.11 \setmainfont{Cardo}

?
*****

The Cardo font is installed on my system and works in other applications 
(and used to work fine in TeX).  Any suggestions?

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