Why cant I download an Attachment?

I cant open attachments. When I click on an attachment I get two options download to computer or drop box.?

• After selecting "download to computer" I used to get asked if I wanted to "Open attachment" and now nothing. Bottom line...I can't open attachments at all.

• Answer:

  After a month of the same problem starting mid November 2013, I finally fixed this which was a problem on several but not all computers. I went into yahoo mail settings and clicked on Security and clicked on the option to always use email in "https" and suddenly after a month of misery, the pop up window popped up with the attachments when trying to open them. Interestingly after going back to Security, the option disappears from Security after choosing it. Incidentally, hard to find but this is also an official yahoo answer from yahoo but I fixed it prior to finding that out. They acknowledged the problem.