Well, I finally fixed it (according to preliminary testing), simply
by recreating the nib file from scratch again. The difference with
the first time I did this is that 1 I installed a fresh copy of the
developer tools, and 2 I copied almost nothing from the original nib
file to the replacement copy, instead recreating most objects totally
afresh.
So it looks like some object(s) in the nib file had become corrupted.
Either way, I'm glad this appears to have been resolved.
Thanks to Yann and Shawn for their suggestions.
António
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