I have Samsung Note 8.0 tablet with android 4.2.2. I cannot view attachments in Yahoo mail when using the browsers (android stock browser, Firefox and Chrome). Instead I get a warning that the attachment is untrusted, invalid certificate etc. I have Norton Mobile Security installed but the problem persisted when I uninstalled Norton. I have the Yahoo app and can view most attachments using this but the app does not have signout capability so I prefer to use the browser. I do not have the same problem with Yahoo mail on my Macbook or Windows computers. Any suggestions.