I had a VIP HTP run recently, and noticed that I do not get any EXP from normal mobs and can't loot any drop after that. I had the HT Victory buff on me during that time. Both pet on / off did not help me too. In between my mob hunting and getting HTP, I went to exchange egg for Dragon Stone, went to free market a while, and travelled to Orbis & El Nath from Leafre. My solution was relogging. Wonder what actually happened