Sorry, I thought that I had posted this reply earlier.
Thanks!
I can't see how what you showed me is different to what I had, but yours worked, and mine didn't.
There must have been at least one difference, but I couldn't see it.
I know that the manual has a list of some of the more common tags that people might want to use, but do you know if there is a complete list? Again, you'll find it immediately, but I couldn't find such a list.
And finally, hopefully, is there any way to edit the list in the order that I want to use those tags? I will hardly ever use the colour tags, so it doesn't make sense for me to have them at the top of the list. But other tags, such as bold, italics, text-alignment that I've added and now this one are much more common for me. I can see that I can re-order the tags that I add, but I can't see any way to put my tags higher up in the picker.