Until a fix is available:
includes/languages/[your custom template directory]/english.php (or your preferred language define)
This at least will tell customers what is going wrong and what to do about it.
define('ENTRY_STATE_ERROR', 'Your State must contain a minimum of ' . ENTRY_STATE_MIN_LENGTH . ' characters.\n\n
**If you cannot complete your edit or selection of your state, this is a software error.
Please *close* your browser window, reopen, restart your registration and select state before hitting Submit.\n\n
We regret the error. Thank you for your patience.');