I cant see attachment in the note

hi

Upon upgrading CRM from versions 2013 to 2015, some users are unable to see the 'attachment' link in the notes section

We have taken the following measures to find the reason for this which were unsuccessful

1- Current browsers were uninstalled and were replaced with the latest versions

2- For users that were unable to view the link, we created the same role as for the users who were able to view the link

3- On user systems that were unable to see the link, we logged in using usernames of users that were able to see the link---result: users were unable to view the link

4- On user systems that were able to see the link, we logged in using usernames of users that were unable to see the link---result: users were unable to view the link

5-users able to see the link experience different results on different browsers for example the link is visible on chrome but not on IE