Hi. I'm having a similar problem and have some more details.
The problem happens whe using Gmail and the latest Google Chrome.
If I click on the link to download the bill, a new tab appears with a blank page, then disappears, with no file downloaded.
If I right click on the link and choose Save Link As..., after choosing the destination folder, I get a warning message saying that the bill can't be downloaded securely. If I choose the keep the bill, I get the bill.
I don't have this problem when viewing Gmail through a 3rd party e-mail program. Even though it calls up Google Chrome to save the file, it works without any problems.