[MiKTeX] New incompatibility with Beamer

[Colin M. <col...@ca...>]

A beamer document which worked last August now generates an error
message (using MiKTeX 2.8 and Texworks with all current updates).
Below is a minimal compilable file which generates the error, followed
by the error message.  No actual document is required.  The request to
use xypic options generates the error.

I can work without Beamer, but not without xypic.  I hope I can use
both, as I had been doing.

thanks for any help, Colin


\documentclass{beamer}
\usepackage{xy}
\xyoption{all}
\begin{document}
\end{document}

! No room for a new \dimen .
\ch@ck ...\else \errmessage {No room for a new #3}
                                                  \fi
l.118 \xP@newdimen\xP@yd