Guild message gets spammed away by other chat login scripts (especially /help)
When you log onto your character and you're in a guild with a guild message currently activated, you are unable to see the guild message because of all the other notifications that are spammed to you AFTER you login.
Either increase the chat log display limit or give the option to NOT receive the blue text (AKA the /help spam). I don't know why it would spam new players in the first place without the option to shut it off. It basically gets cut in half because of all the other spam that follows. See the screenshot chat.
Guild messages are meant to be displayed especially when guild members log in.