Although it doesn't fix whatever issue you're seeing, you should strongly push for getting IE8 upgraded ASAP. Do all that you can to either get modern versions of Chrome/Firefox as the standard, or get IE upgraded. You're on the very last JIRA version to support IE8, and Microsoft will be terminating its own support in the next few months: https://support.microsoft.com/en-us/gp/microsoft-internet-explorer .
JIRA 6.4 has massive performance benefits which you can't really take advantage of if IE8 is dragging you down. It's really in the best interest of your organization to not use IE8 anymore
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