When attempting to submit a post, I received an error that my class level was not high enough. In order to post, I had to change my profile settings so that my designated "main class" level was high enough (in my case, I changed from ARC10 to LNC50).
Suggested fix:
Please make it so that the forum detects the maximum level of a player's classes rather than using the level of the class that the players declares as their main class in settings. Also, please make it so that the required level for posting is displayed along with the error.