You can always try the 'Contact' form on the site, it's not likely anyone here is going to be able to give you good advice
I know, as I've said, I've sent them an email through that form two days ago but have still gotten no response.
2 days ago was Friday, it's likely they don't work the weekends.
Could be so, though it doesn't look like a site where the devs have a fixed time schedule. (Not that I know much about managing a website, just my impression.)
Are you on a VPN? Sometimes that screws with CAPTCHA
Nope. I actually tried using a proxy and it got rejected for that very reason (with a different message), whereas two normal IPs had the problem described in OP.
Have you tried running Wireshark or something similar so you can see what's happening on the back-end?
My suspicion was correct, I can't figure it out.
No, I have no idea what that is and I suspect I won't be able to figure it out, but I can give it a try.
This wouldn't be a tool for wireshark. It could be a tool for the browser dev tools though. With it you can see every time a website tries to make a connection out, what data is submitted, and what the response is. Unfortunately, if you don't understand how http works, it might be all Greek.
...What?
All about open source! Feel free to ask questions, and share news, and interesting stuff!
Community icon from opensource.org, but we are not affiliated with them.