Comment #4 on issue 3150 by [email protected]: Problems with MatrixSymbol and simplifying functions
http://code.google.com/p/sympy/issues/detail?id=3150

It looks like it boils down to .args containing non-Basic elements (a string):

from sympy import *
A = MatrixSymbol('A',2,3)
A.args
('A', 2, 3)


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