So e621 is working for some people and not for others still. It wasn't working for me until I tried going to e621 directly and was given a captcha to pass. I'm assuming they're doing that because of the attack the other week? Anyways, after passing the captcha, heat control worked with e621 again. If it's actually connected and not a fluke, maybe that gives the browser apps you're using permission to access e621 also? I'm no expert so make of that what you will.