Based on my past experience, you should PM theymos about this problem along with link (e.g. pastebin link) which include context/text which blocked by CloudFlare. It's not always can be fully fixed though.
He should try and update his Tor browser. What can make browsers including Tor not able to pass captcha is becuase the app is old and not updated.
I doubt that's the problem since by default Tor Browser automatically update itself.
If you still experience this issue after updating the browser, go to settings and reset the settings to default,clear cache and then reload the webpage.
Tor Browser already clear everything when you close the program, so your advice isn't really helpful here.