Due to an issue with Guild invites locking players out of a server, all players who had outstanding 24 hour cooldowns on guilds at 2am UTC+0, 6PM PST, have had their cooldown removed. Any players who leave a guild after that time will once again have a 24 hour cooldown.

To invite a member to your guild, please use a server that we are not using for events or node wars. These servers are listed below:

[NA]
Balenos-1 
Serendia-2
Kamasylvia-3
Valencia-4

[EU]
Balenos
Kamasylvia
Valencia

We are working to fix this issue for launch.