difficulties closing plot windows / ndiffq availability

Hi,

I'm just starting with maxima, and have a couple of simple questions:

1. When I generate a plot, I can access the menu in the top left hand
   corner, but when I click on "Dismiss" or any other item (Help,
   Zoom, ...), I get no response:

   plot2d(x, [x, 1, 5]);

   I end up having to close the window by using the window manager's
   close button.  My plot_options include [PLOT_FORMAT, OPENMATH] so I
   believe I am using the default graphing tool.  Am I doing something
   wrong?


2. The maxima.info files state that LOAD("NDIFFQ"); will load the
   numerical integration tools.  When I do this, I get the error:

Could not find `NDIFFQ' using paths in FILE_SEARCH_MAXIMA,FILE_SEARCH_LISP

   I could not find any files in the maxima source tree with that name
   -- are they not there now?  Are there any other Runge Kutta/
   alternative numerical ode solvers available?

Version info:
% maxima
GCL (GNU Common Lisp)  (2.5.3) Mon Jan 19 11:26:56 GMT 2004
Licensed under GNU Library General Public License
Dedicated to the memory of W. Schelter
 
Use (help) to get some basic information on how to use GCL.
Maxima 5.9.0 http://maxima.sourceforge.net

Running on redhat 9 linux box, compiled from source.


Thanks very much,
Stephen Eglen

-- 
Stephen Eglen
Institute for Adaptive and Neural Computation, School of Informatics
University of Edinburgh, 5 Forrest Hill, Edinburgh, EH1 2QL Scotland
Tel +44 (0)131 650 3088      http://www.anc.ed.ac.uk/~stephen
Fax +44 (0)131 650 6899      stephen@anc.ed.ac.uk