I tried a couple of different browsers (Safari, Chrome) and have the same issue on both. Clicking "Run" results in a blank page on the Output tab. Preview works, though.

Hello looper,

I'll check what may be happening at the last minute of today. Regards!

Mine are working in both Chrome and Firefox. In the editor screen and when clicking Preview.

Loopernow, try now.

Thanks for report.

Working for me now. Thank you!