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Fatal crashes on Windows

Dear all,

I've been putting together a data analysis tool in the PLT Scheme 
v.103p1 environment.  At present, I seem to have encountered a 
problem with the GUI environment, which is leading to fatal crashes 
on windows systems, specifically Windows98 and WindowsME.  Sometimes 
my program just crashes, sometimes it continues but widgets are 
painted white, and sometimes the following message appears:

>program Error fatal class WxWindows
>Error: Can't create window of class WxCanvasClass (87).

The problems tend to arise with multiple open windows, when resizing 
or using a slidebar; these windows sometimes contain several internal 
panes and widgets.  The problems do not occur when running the same 
source code on MacOS 9.1, which is perfectly stable, and we have been 
using the downloaded binaries, in all cases.

My question to the list is: has this problem occurred for anyone 
else?  And can anyone suggest a cure?

	thanks for any help,


Dr. Peter Lane
ESRC Centre for Research in Development,
Instruction and Training (CREDIT)
School of Psychology, University of Nottingham

Email: pcl@psychology.nottingham.ac.uk
Tel:   + 44 (0) 115 951 5310
Fax:   + 44 (0) 115 951 5324
URL:   http://www.psychology.nottingham.ac.uk/staff/Peter.Lane