After much struggling to find the source of a pesky bug that seemed to affect users at random when Sync'ing or Logging into the online site using their password, I was finally able to find the tricky condition that caused this.
On the upside: problem is fixed and, once your password has been reset (see below), you should never experience any of these strange log-in issues ever again (don't hesitate to contact me if you do).
On the (very big) downside: for security reasons, all passwords for online use had to be reset
- If you are only using your account for KB Sync with the iPhone version, this does not affect you: keep sync'ing as usual with your regular password.
- If you want to log into the online version using email + password, you need to reset your password by one of the two following methods:
1) Log into your account using the 'Facebook' button. On the main page, use the 'Change password' button in the Settings section.
2) Browse to https://kanjibox.net/kb/?pwd_reset=1
and follow the instructions to recover your password (your login email address needs to be valid).
Sorry for this (big) hiccup. Hopefully, this is the last you hear of login/sync issues... Don't hesitate to get in touch if you run into any problem.