Lost ability to work with posts on just one of multiple blogs

Hello,

Since last Friday, I've lost the ability to work with posts in just one of 
the 5 Blogs I have (BlogID=5473757184421684574). It's a private blog, as my 
company is developing a news site, but aren't done yet.
I'm using Blogger API v3 ,and I'm able to retrieve Blog information, but 
unable to access/modify/insert my posts information for only that Blog. I 
get 404 not found (posts.list) and 403 forbidden (posts.insert). It stopped 
working since last Friday.
Neither the API explorer nor my App works for that Blog.
I'm able to work through Blogger UI, and I'm able to work with Blogger API 
v1, but I need Blogger API v3 in order to use the "Read More" functionality.
FYI: I've tried accessing the same blog from two different Apps from two 
different accounts (both with administrative access to that Blog) to no 
avail.

Could someone at Google look into this?
It looks to me as a bug.

Thanks and best Regards,
Vicente

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