Hi everyone,
On IE we found a bug in JIRA 7.10.2. with activity button. It looks like comment/history is overlapping, so button is not accessible.
It's not accessible in Internet Explorer, while in Firefox, and Chrome works fine.
IE version affected : 11.165.17134.0
We found workaround for this problem.
Go to Announcement banner and add this code:
#activitymodule .issuePanelWrapper
{
position: static !important;
}
Hope it helps.