TYPO3 Core

ok, it's the popup blocker. So can you please change the link, not using a popup but a _blank or anything else.

I thinkt, that many people have popup blockers activated and feel confused when no preview appears.

Best wishes.

Thanks for your report. I fear that it won't be possible to open the window directly "on click" (which wouldn't alert popup-blockers), because of the new technology involved here (ExtJS and ExtDirect).

Usually the browser's popup-blocker open a bar on top of the content area alerting the user about it, and he has the choice to allow popups from this particular site. The user needs to do that only once and it will then work as expected.