What are these Green buttons and Grey buttons by the title of a topic on the forums ;D

Green indicates a thread that has responses you haven't read yet. It turns grey when you've read every response and then green again when there is a new one you haven't read.

Thank you.

You can also click the newspaper/arrow icon by the green buttons to be taken directly to the first post you haven't read. :)

thanks.

Holy crap, I never knew that! I always assumed the newspaper looking thing was to tell us that it was unread--didn't even know it was clickable.

Thanks for the info <3