Blogger Insert Post suddenly not working as of 9/11/13

Has something changed in the Blogger API as of 9/11/13?  I was able to 
insert posts last night, but today I keep getting 403 ("Insufficient 
Permission") errors.  To rule out something in my code, I tried using the 
API Explorer at 
https://developers.google.com/blogger/docs/3.0/reference/posts/insert#try-it to 
insert a post into my test blog.  I authorized the requested scope (
"https://www.googleapis.com/auth/blogger") and used the following post 
resource:

{
"kind": "blogger#post",
"blog": {
"id": "6559461792031697019"
},
"title": "Test Post",
"content": "<p>This is a test post</p>"
}

When I tried to insert the post, I got the following error:

403 Forbidden

- Hide headers -

cache-control:  private, max-age=0
content-encoding:  gzip
content-length:  136
content-type:  application/json; charset=UTF-8
date:  Wed, 11 Sep 2013 17:32:13 GMT
expires:  Wed, 11 Sep 2013 17:32:13 GMT
server:  GSE
www-authenticate:  Bearer realm="https://www.google.com/accounts/AuthSubRequest", error=insufficient_scope, scope="https://www.googleapis.com/auth/blogger"

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "insufficientPermissions",
    "message": "Insufficient Permission"
   }
  ],
  "code": 403,
  "message": "Insufficient Permission"
 }
}


What is going on?  Have the post publication scopes changed?  This is 
causing an outage in my production application, so I'd appreciate any 
information anyone can provide.  

Thanks,
Gemma

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