I was also having the same problem while trying to view pdf or Xetex with
Miktex. I re-install the Miktex 2.8, the old one, and resolved the problem.
You may try the older version of Mactex.
Shyam
On Mon, Aug 8, 2011 at 10:00 AM, Jürgen Spitzmüller <sp...@lyx.org> wrote:
> Maria Gouskova wrote:
> > LaTeX Error: Command \B already defined.
> > LaTeX Error: Command \T already defined.
> >
> >
> > \newcommand{\B}[2][0]{\Bk{#1}{0}{#2}}
>
> This line is from xyling.sty. I suppose it conflicts with some other
> package,
> which defines \B before xyling is loaded.
>
> You can try to find out more by adding \show\B in the preamble before
> xyling
> is loaded. This outputs the current definition of the macro to the
> preamble,
> by which you can search (via spotlight) the responsible package.
>
> HTH,
> Jürgen
>
