1. When loading Citadels, you can see a special window which suggests you activate Flash Player. Clicking it will open browser setting where you can allow running Flash Player.
2. However, this setting may be blocked and you will have to do it manually. For that click the small lock in the address bar.
3. Open the drop-down menu near 'Flash' and choose 'Allow' option.
4. This will trigger the bar with the 'Reload' button. Click it to refresh the page.
5. The procedure might be repeated every time you open the browser.