New user registration no longer works after V1.4.0 upgrade

Not sure if it is due to the fact that my forum is using a foreign language, but my forum completely failed in terms of new user registration. Even myself can no longer register a user.

Should I revert to my old version, or wait for a fix? Thanks.
Thanks to Brogan, the issue has been fixed. It was due to the add-on called "TAC FoolBotHoneyPot - Stop bots from registering with honey pots"