mactex-utilities: Problem with tex() and matrices.

Hi all,

I'm encountering a lisp error when trying to use mactex-utilities and 
the tex() function.

This began with the new 5.11.0 release, and I'm pretty sure that I
got mactex-utilities off this list a few months ago, at least it worked 
with 5.10.x.  (I'm sorry I can't be more specific, it has been a while 
since I've used maxima although I've updated in the meantime)

In trying to have the latex style tex() fractions, I'm loading
mactex-utilities to get this.  However it errors when I feed it a matrix 
and refers to a list problem, as demonstrated below.

Does anybody know why this is occurring?  Thanks a bunch,

Peter Gustafson

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(%i1) constitutivecoeffs_a:matrix(
[(va13*va31-1)/Ea11,(va23*va31+va21)/Ea22,0,
   -alphaa33*va31-alphaa11],
[(va13*va32+va12)/Ea11,(va23*va32-1)/Ea22,0,
   -alphaa33*va32-alphaa22],[0,0,-1/Ga12,0])$
(%i2) define(ea11(x),
   -constitutivecoeffs_a[1].[Sa11(x),Sa22(x,y),Sa12(x,y),DT])$
(%i3) tex(ea11(x))$
$$\left(\alphaathreethree\,\vathreeone+\alphaaoneone\right)\,\DT-{{
  \left(\vatwothree\,\vathreeone+\vatwoone\right)\,\Satwotwo\left(x ,
  y\right)}\over{\Eatwotwo}}-{{\left(\vaonethree\,\vathreeone-1\right)
  \,\Saoneone\left(x\right)}\over{\Eaoneone}}$$
/* NOTE: everything is working so far, except as follows...... */
(%i4) load("mactex-utilities")$
(%i5) tex(ea11(x))$
$$
Maxima encountered a Lisp error:


APPEND: A proper list must not end with " "

Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to nil.
(%i6)
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