When I try to download any of my documents from the the Documents page I get this "toaster" error message:
Download error
Exceeded maximum number of files (50) or total size (100 MB).

My biggest file is 370k large and the total number of files in my account is 6.

When I try to download any document from within, while it's open, I get an XML page:
SignatureDoesNotMatch:
The request signature we calculated does not match the signature you provided. Check your key and signing method.

None of my document are signed in any way.