Since my last posting, I've discovered that gmail is suddenly working how it used to again. Perhaps it was all a dream!
I started adding gmail footers to my emails today, hoping that they can ensure that client's always have my details to hand. I found that after adding it and saving, it took almost three hours before they started appearing.
I also notice that they add two lines before the footer. So if you put "DAVID" as your footer, at the end of your email you will see:
Even though you never entered the "--" bit. It's not the end of the world, but worth being aware of. Especially for me. In Chinese "-" looks a lot like the character for "one", so having extra things lying around is only going to cause confusion. I can imagine emails reading "so call my number on 02231 434 223", and then the computer adds "11" on the next line. The problem is mitigated by the fact that most people don't write "-" to mean one in Chinese, they usually use "1", but a little control would have been nice!