Problem solved

Gentlemen,

I have installed the latest Tex Live, followed by Xetex once again, and 
everything works swimmingly. Thank you all, especially Jonathan, for 
pinpointing the problem.

On first using xetex, I must remark how slow it is. It shouldn't matter 
I guess, since one can use plain tex to test a file during the writing 
process and only at the final stage use xetex when proper output is 
needed. Still, it would be nice to speed it up, although if the holdup 
is in ATSUI then we may need to wait for an OS revision before anything 
changes.

Thanks for all your help,

Sincerely,
Laurie Field.