Problem with Shadowing

hi there,

I have a problem with Shadowing propagations model. When i use it ns-2 calculares distance distCST_ 179769313486231570814527423731704356798070600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0

simulation is provided for 802.15.4 so distance should be at least few meters. The problem is not in tcl script but i think somewhere else.
i changed parameters, mac type, seed etc. and error is still occuring.
When i use other propagation models twoo-ray groung and free space model everything seems to be all right.
This strange distance occur when is use built-in examples

And this value is constant for every parameters.

I use 2.31 allinone (and Cygwin under XP). I checked results for 2.29 allinone and ther is the same results.

have you got an idea what is the problem?

Thanks in advance