with the 3 character captcha, there's nothing really to worry about, and nothing that would cause issues other than not letting you sign in successfully. in that case, you just need to refresh the page until you get the normal 8 character captcha. still, if you aren't able to login, create a second account and send a message to SR Support from that new account: http://silkroadvb5piz3r.onion/messages/send_message/104259