Thanks for the nice fix.  I've managed to break things in a new way:

>>>
sage: from sympy import Symbol
sage: x,y=Symbol('x',False),Symbol('y',False)
sage: 1/2+y*x
x*y + 1/2
sage: y*x+1/2
1/2 + y*x
<<<

The 'False' argument to Symbol here means the symbols are non-
commutative.  Adding a rational breaks this, depending on the order of
addition.  Seems like this is more likely a Sympy bug than a Sage bug
though.

David
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