In article <
5a752095...@avisoft.f9.co.uk>,
Just to follow up my own question, after considerable rootling I have
found it was my fault!
I have a modified version of Config in Choices:Fireworkz, to change
the Date & Time formats available. However, it was so old that the
Edit Row & Column menus have changed order since, and that must have
caused my weird problems.
So, beware of user-modified Config files!
Martin