Z coodinate from llGetPos always reporting zero

Am I doing something wrong or is it a bug that the Z coodinate from llGetPos is always reporting zero, the X and Y report correctly. I was building something that depend on knowing a change in height. I thought I was going crazy looking for scripting errors when I decided to put in :
current_position=llGetPos();
llWhisper(0,(string)current_position);

this would give me something like :
<100.0098,90.8765,0.000>

current_position.z ALWAYS equals 0.000 !!!!!!!!!!!

Has anybody else noticed this? Or am I makeing some really dumb mistake?

It's working fine for me. Try it on a different sim maybe to test?

-peekay