Clear your cookies and history (or all save data if you're on New 3DS). I made a video in the original post showing how to use it.
Done that several times on my o3DS, even with the browser save data. I previously tried doing it with your video before posting, but that didn't help my problem either. I'm not running any other exploits, no different themes other than the default, and the boot.3dsx is the latest one and is in the root of the sd card.
Honestly I think my 3DS has a vendetta against me.