Alright, well, unless I've gotten incredibly lucky, I have solved it and I can use my bot now without authentication issues. I think the issue was using the updater that comes with HB's client itself, because that's right when it started happening (after I updated it via the client itself). A friend of mine who uses this bot a lot suggested that I try and grab the version from here (the icon on the main page) rather than using the updater. After doing that and making a new folder to extract HB to, I was able to successfully log in HB and bot once again.