I would like to thank member kuyttendaele (Karel) for bring to my attention the fact that you get the standard forum error message when you try and upload an avatar.
The problem occurred sometime ago due to a Microsoft security update which altered some inherited permissions. This did not affect all members and those who joined over the last 18 months or so did not have this problem.
So, if you wish to add an avatar or update your existing one, then please go ahead and let me know if you have any issues.
Location: Hampshire, England