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Mathematica 6.0 Desperation

 Dear Sirs

 I have tried some items that seem to hang Mathematica 6.0. However  
 they work perfectly fine in the 5.2 version. I have tried to  
 discover the flaw and I have not been able to do so. The problem  
 pertains at some code I extracted from a book about Mathematica  
 applications by Boccara, particularly the examples that relate to  
 fractals, Julia and Mandelbrot Sets.

 I have below the lines of code. I you try them, I'd wish to see if  
 you are able to make them work.

 Yours sincerely,

 Jesus M, Goiri

 JuliaTest = Compile[{x, y, {n, _Integer}, {c, _Complex}},
   Module[{z, num = 0}, z = x + y I;
     While[Abs[z] < 2.0 && num < n, z = z^2 + c; num++]; num]]
 DensityPlot[JuliaTest[x, y, 50, -0.75 + 0.5 I],
 {x, 1.24, 1.27}, {y, -0.13, -0.1}, PlotPoints -> 500,
 Mesh -> False, ColorFunction -> Hue]

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