Platform: Windows 7 64-bit
ISP: Time Warner Cable
Type of Internet Connection: cable modem
Date & Time: ~4:25pm EST
Frequency: Sometimes

Character Name: Janga Maky
Race: Miqo'te
World: Saronia
Class/Skill Rank: CNJ 37
Physical Level: 50
Area and Coordinates: Camp Tranquil & Camp Emerald Moss
Party or Solo: Party
NPC Name: N/A
Monster Name: N/A
Leve: occurred during Sapped Saplings and others
In-Game Time: didn't notice... around 7:00 12/16

Steps:
1) Self or party member initiates leve, causing the error to display: "Changing classes during the course of this duty, or completing it as a class or rank other than those recommended, may reduce awarded skill points."

2) During the leve, after killing enemies, the message randomly displays: "Changing classes during the course of this duty, or completing it as a class or rank other than those recommended, may reduce awarded skill points."

Logging out and restarting the game does not fix the problem.