Matrix is singular to working precision

2012 3 4
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I was using Matlab 2010 and my code was working fine! I changed my windows and start using Matlab 2011b and I am getting this warning for the same code:
Matrix is singular to working precision.
I have absolutely no idea what could be the problem. In fact, I am running a power flow in Matlab and it used to converge with the same code before but now the load flow can not converge either.
Would be glad if somebody can give a hint :)

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Jan
Jan 2012-3-4

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Without seeing the command, which causes the problem, it is impossible to guess the reason of the problem.
Are you really sure that you are running the same code with the same data?

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Ahmad Karnama
Ahmad Karnama 2012-3-5

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Thanks Jan for your answer. This is the part of the code which generates the warning:
%%evaluate Jacobian
[dSbus_dVm, dSbus_dVa] = dSbus_dV(Ybus, V);
j11 = real(dSbus_dVa([pv; pq], [pv; pq]));
j12 = real(dSbus_dVm([pv; pq], pq));
j21 = imag(dSbus_dVa(pq, [pv; pq]));
j22 = imag(dSbus_dVm(pq, pq));
J = [ j11 j12;
j21 j22; ];
%%compute update step
dx = -(J \ F);
and I think it causes the load flow not to converge! I thank you in advance for your help :)

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Jan
Jan 2012-3-5
I suggest to check, if F is near to singular on both Matlab versions.

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