I think this is a problem, might be not a bug. If you made a mistake in a for loop (like I did on the picture): You have to wait until the loop finishes in order to see a mistake (it might take quite a long time). I've made a mistake with random function but the error reported after I tried to see the matrix A.
Regards, Radovan
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"