The screenshot applet's certificate that was used for signing in JIRA 3.8 has expired since July 2007. This may cause a popup to show up prompting users to accept the expired certificate first before they can use it. When users select the screenshot option, they get a warning that the certificate is not valid - it appears to have expired in July. As long as they click to continue, it works ok but many users are reluctant to do so. I've attached an updated screenshot.jar to this issue that has been re-signed with a valid certificate.