Gmail? For now, you have to allow pop-ups for google.com to work around some change in Gmail. While you have the compose window on the screen, click the padlock in the address bar. * If the pop-up permission is listed there as Block, change it to Allow. * If the pop-up permission is not listed there, click More Information to launch the Page Info dialog, then click Permissions in the top bar. Scroll down to "Open pop-up windows", uncheck the box for "Set default" then click Allow and close the dialog. Then try the paper clip again. Google should at some point provide an update on how it will resolve this in the main thread here: https://productforums.google.com/d/topic/gmail/q0BxcGOa6pk/discussion