multiplication yield strange results

Hello,

I call the following bit of code repeatedly during the execution of my program:

Bx:= self.n[0].A*self.alpha[0].c + self.n[1].A*self.alpha[1].c + self.n[2].A*self.alpha[2].c;
By:= -self.n[0].A*self.alpha[0].b - self.n[1].A*self.alpha[1].b - self.n[2].A*self.alpha[2].b;
Bsqr:= Bx*Bx + By*By;

At first all goes well but suddenly Bx and By get extremly large (around 1E205) which turn Bsqr to INF.
Typical value before failure:
self.n[0].A -9.39E-7
self.n[1].A -9.45E-7
self.n[2].A -9.45E-7
self.alpha[0].c -30.08
self.alpha[1].c 62.99
self.alpha[2].c -32.90
self.alpha[0].b -30.08
self.alpha[1].b 62.99
self.alpha[2].b -57.07


This does not happen always at the same iteration, so I suspect the problem could be something completely unrelated to this piece of code, like an unitialized pointer.

Using memProof I have got a lot of error related to VirtuallAloc trying to reference an invalid address. Could that be relevent?

Well I am completely lost any help apreciated.


Gilles
.

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