Experimental release 7.0a3 alerting Cloudflare
With the current experimental release (version 7.0a3) one gets Cloudflare captchas much more often than with the stable release (version 6.5.2). Your may try both versions with the same Cloudflare-protected website (say www.whatismyip.com for example). As I currently encounter some difficulties building the Tor Browser bundle from my machine, I have no concrete clue where the issue comes from though.
Trac:
Username: johanansmith