new web e-mail

Can not open my emoticons on my new web e-mail.  When I click on it no pictures show up,  sometimes it will say people. or previously used, but still no pictures, I wrote a few days ago, but then they came on for just a few hours, now can't get them to open again.  Can any one help? Why do they come on once in awhle, not then be able to get them? Thank you for any help.