Gixx letter for "The Ghost Rite"
Make sure to empty your mailbox, and, as odd as it sounds, to pick up any items that may be waiting for pick-up from the Trading Post. Log completely out and back in.
You can also try a -repair of the client, in case of corrupted file. Top of Page – Support – KB – Search (Repair).
Good luck.
Emptying the mailbox from all the event-mail (had no player mail in there) actually did it. Halfway through, the PS content guide updated. Thanks for the workaround.
My bug report remains though, because this is far from “working as intended”.