1) Stage 1 monsters are randomly spawning instead of all of them spawning together. It was not like that in the old source. 2) Leader of the party will lose all his/her keys in his/her inventory during stage 1 while the rest of the members will not. Additionally, @ABunny claimed that her keys were lost even as a member as well. 3) NPCs in APQ respond very slowly. For example, in stage 2, the combination was already correct and but the NPC didnt open up the portal. NPC only did after i have clicked 3 times. 3) Stage 4- Cupid code piece are difficult to collect when other players drop them. 4) Random DC after every stage. Not sure if this is a bug but i have seen one of my member DC in 2 of my APQ runs.
1st one is not a bug. 2nd one was fixed some time ago. I don't understand the 3rd one, are you not able to loot them if a player drops them? 4th one doesn't appear to be any problem with the number of APQ runs being done and the lack of bug reports for it.
if the leader clicks on the NPC with less than 50 code pieces, the leader would not be able to loot them from other members for a short period of time