Is the infobar with the allow button failing to appear when a pop-up is blocked, or clearing itself too quickly? Another way to allow pop-ups on a site is, before triggering the popup, click the padlock or globe icon in the address bar, then the "greater than" sign (>) and then More Information. Click the Permission icon and scroll down to "Open Pop-up Windows" and uncheck the box for "Use default". Then you can select Allow for the site. Does that work any better?