Reported: The client crashes when a new level 1 Bellato Warrior receives the starter equipment. After a restart the items are in the inventory and the quest is gone.
Found: The starter quest's completion updates the client's quest tracker, and the server told the client to read an older quest file than the one its quest text comes from. The tracker line came out longer than the client allows, and the client closed itself. The items had already been saved, which is why they were there after the restart. RF455-063 has the same cause.
Fix: in the next RF 4.55 update, the server tells the client to read the quest file that matches its quest text, so the tracker line stays within the client's limit.
To verify: create a new character of any race and class, finish the first briefing, and check that the client stays open as the starter equipment arrives.