Those using anon, proxies and even Tor Browser might face difficulties even after clearing cache. So far none of the anon, proxies etc I have tried can clear cloudflare. It just lands on the unformatted forum page. Tor is not an issue for some but others will end up with the unformatted forum page even after you clear cloudflare with Recapcha. If you do, go to the top left hand corner where you see the username and password boxes. Enter and submit and you will have to clear another ReCapcha to gain access to the full formatted forum page. You however still have to sign it again but this time with no further checks.
No issues with VPNs and straight.
Do let us know you experience though.