Version:            (using KDE KDE 3.5.0)
Installed from:    Fedora RPMs
Compiler:          version gcc 4.0.2 20051125 (Red Hat 4.0.2-8)
 
OS:                Linux

this bug occurs only in multi-screen environnement.
Parameters selected from kcontrol/panel/hiding :
  Hide Mode :
    Hide automatically
      1 sec
    Raise when th pointer touches le screen's 
      Bottom Edge    
  Panel-Hiding Buttons :
    Show right panel-hiding button
  Panel Animation :
    Animate panel hiding
      cursor between Medium and Fast

The problem is : on the first screen (screen 0 in multi-screen), when the mouse leave the panel zone, the panel zone is supposed to be hidden following the parameters described above; But it doesn't... until the mouse reach the right or left or top edge. 
We do not have the problem on the second screen. On the second screen, the panel disapears 1 seconde after the has left the panel zone.