🗨 In case this has effected anyone else – I just realised that after recently re-installing the up-to-date Autonomie theme package that my ‘Recent Posts’ weren’t displaying the current date if I’d not provided another title, as I had previously set them up to do. They were displaying “(no title)” instead.
I’d forgotten that, prior to re-installing the theme package with the necessary fix for double content, I’d edited the theme’s function.php file to Change the Post Title to the Current Date as per Chris Reed’s post. I re-added the code available at the above link and all appears to work again.