TeX "matrix" command not working since update

TeX "matrix" command not working since update

[L.S.-Soc&Gam]

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Hi guys,

i've already searched the mailing list for this but i still am having a 
problem while trying to create a matrix.
my code looks like this:

\startformula
S=\left(*\matrix**{*
   \sigma_x *&* \tau_{xy} *&* \tau_{xz} *\cr*
   \tau_{yx} *&* \sigma_y *&* \tau_{yz} *\cr*
     \tau_{zx} *&* \tau_{zy} *&* \sigma_z *\cr*
*}*\right)_{xyz}
\stopformula

But since a few days, there are only empty braces after compilation. The 
funny thing is, i worked already. but i've updated context at least once 
since (only 5 days ago, betas included) and since then after compiling 
there are only empty braces. When i enter

\startformula
S=\left(
1234
\right)_{xyz}
\stopformula

the 1234 shows fine between the braces. so it seems to have to do with 
\matrix command in some way...
i don't know any alternative way to create a matrix. any help would be 
appreciated.


Greetings,

Sebastian


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