Make sure you are testing/running with a fresh HB install! This means deleting the HB folder and reinstalling. Do NOT delete Plugins, Quest Behaviors, Profiles or any Custom classes you use other than singular, unless you plan to just reinstall those too. Until the quest completion bugs are fixed, this is a DAILY NECESSITY!!!
Do not just overwrite your install with a new one, this will not fix it or count as a fresh install.
If you still have issues, please post, listing the quests/profile you are seeing issues with, and if possible, a log for me to use.