Simulation gets rid of nodes?

i would like to join this question subject and add some example of my own :

hi.

i have encountered a strange bug related to the Quatrus II web edition

i am using a simple module which sends data to another simple model - on a wire called "to_bcd3"

for the same reason mentioned before

when i am trying to debug the module ( Bug number 1) by adding the "to_bcd3" wire the simulation results plot

i am receiving a warning "this line was not found" though i added the line using the "Node finder"

so in order to view this line on the simulation plot - i changed the outer module :

this is the file before:

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module Bin_to_bcd_top( iBin, oBCD);

wire [9:0] to_bcd3;

This are the the only changes i have made

-------------------------------------------------------------

changed : module Bin_to_bcd_top( iBin, oBCD, to_Bcd3);

added : output [15:0] to_Bcd3;

what drives me nuts is this - not only that now i could debug the line's data

(which is good) but the bug had mysteriously disappeared !!!

and the module works just fine now....

of course if i'll remove the line from being an output - the inner module will again

stop receiving the data.

appreciate any help