In povray-3.50c's unix.cpp, function HandleXEvents(), there is 
some code which reads as follows (line 3382): 

-----------------------------------------------------------------------
  else if (theEvent->xkey.state | ControlMask && (theKeySym == XK_L ||
         theKeySym == XK_l || theKeySym == XK_R || theKeySym == XK_r))
  {
    refresh_y_min = 0;
    refresh_y_max = Frame.Screen_Height;
  }
-----------------------------------------------------------------------

This is a bug. It must be: 

-----------------------------------------------------------------------
  else if ((theEvent->xkey.state & ControlMask) && (theKeySym == XK_L ||
         theKeySym == XK_l || theKeySym == XK_R || theKeySym == XK_r))
  {
    refresh_y_min = 0;
    refresh_y_max = Frame.Screen_Height;
  }
-----------------------------------------------------------------------

Notice the '|' before ControlMask; put brackets around it for clarity. 

Please fix that in 3.51. 

Wolfgang

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