Broken Trading Post
By chance do you keep seeing that loading circle and then nothing happens? If so, try to clear the game cache. Go to your temp folder (under windows vista and above it’s at something like C:\Users\<yourusername>\AppData\Local\Temp, or simply open Start Menu and type temp then press Enter) and look for a folder called something like gw2cache-{<some numbers here>} and delete that folder. Do that while game isn’t running or it won’t allow you to delete it.
More here https://forum-en.gw2archive.eu/forum/game/bltc/TP-Empty-Not-loading/first#post3247980