all tests withoutany addons enabled, only Addon Clearer+Addon Selector
1. No group leader
still cant find valid way to reproduce
looks like its random
probably cannot be fixed by addons
www.youtube.com/watch?v=td05ldoWpzs
2. Preferred Roles bug
Howto:
- A invited B to the group
- after this A setup in "I would like their roles to be" 2 healers, for example
- A invited C to the group
- C preferred role must be different, DD for example
- C will receive additional healer role after this...
- if C will change it to only DD again, and then dungeon mode(normal/veteran) will change, or location of one of the players will change - healer role will be added to a random member
id like to see it fixed by Mer Band-Aid ZO-UI Fixes, please 
www.youtube.com/watch?v=UUNW0CeX8EQ
3. More players leave the raid
When you leave a big group
always wil be promted like some1 else leave group too, but its not true
mby it can be fixed somehow too
Lui Extended has a feature to print in chat all changes in group, so it shows this wrong info in the chat too
www.youtube.com/watch?v=FJPAAlWaAxc
sincerely yours, QuadroTony