Problem with Byond program

[Technature]

Byond is quite the shit client. It might not be updated, the server might be down, it might just not wanna get out of its seat to do its damn job and requires a thorough poke from a stick.

Check if it's fully updated (if it isn't, you'll get an option to update on the home screen). If it's not that, wait a bit and try again. If it's still not working, you might need to reinstall it.

Make sure you're using the beta version too.