mupad out of memory error

I have the following function written in Matlab:

function [Q,B]=gsolve(A,Sc,Sq)

d=size(A); n=d(1); N=d(2);

syms x1 x2 x3 x4 x5 x6 x7 x8 x9  positive 
x=[x1 x2 x3 x4 x5 x6 x7 x8 x9];
x=x(1:n);
c=1; I=[];
for i=1:n
    if bitget(Sq,i), x(i)=1;
    elseif bitget(Sc,i), x(i)=0;
    else I=[I,i];
    end
    c=c*(1-x(i));
end
B=[];
for i=I
    y1=x; y1(i)=1; y1=mgame(y1);
    y0=x; y0(i)=0; y0=mgame(y0); 
    B=[B;(1-c/(1-x(i)))*A(i,:)*y1'-A(i,:)*y0'];
end

Q=solve(B);

The input for this function is the matrix

A =
   0     0     1     0     1     1     0
   0     0     1     0     1     1     0
   0     0     1     0     1     1     0

Now when I perform the command:

gsolve(A,0,0)

I get the following warning:

Warning: Could not extract individual solutions. Returning a MuPAD set object. > In solve>assignOutputs at 123 In solve at 97 In gsolve at 23

ans =

Warning: The result cannot be displayed due a previously interrupted computation or out of memory. Run 'reset(symengine)' and rerun the commands to regenerate the result. > In sym.disp at 22 In sym.display at 17

While my teacher does get a solution to this problem. How can I force Matlab to calculate values for x1 x2 and x3 by using the symbolic math toolbox? I have version 2011a from Matlab and my teacher uses version 2010a, but does that make such a big difference?