I have finally found out that, although Blogger isn't working with Safari, it is running with Firefox. Numerous others are having the same problem but Google/Blogger seem unable to admit anything is wrong on their status blog. As several have commented, the worst thing about Blogger is that they never update the status page until they've solved the problem!
I am a bit worried about this (several years ago, pre-Google ownership) I lost my entire first round blog. So I think I will turn on DeepVacuum and at least download all my hard work over the past three years.