Can't loot dungeon boss/can't banish warlock pets

[Blindguard 0]

So I have two issues, last night we spent 2.5-3 hours inside Zul'farrak and managed to kill Gahz'rilla but none in our group could loot the scale from him, we had the same issue with the last troll bosses up the ramp, no-one could loot him. The items lost from the boss is fine but the scale from Gahz'rilla is NOT fine, we need to find another person with the mallet and that is a hard task. I contacted a GM while I had a screenshot submitted but apparently that's not enough.

Also, I can't seem to banish other warlocks pets, they can easily banish my voidwalker but if I try to banish their pet it keeps saying "Invalid target". What's up with that? I could banish their pets in the low 20s. Not anymore, level doesn't seem to matter as a 34 can banish my 43 voidwalker.

[Blindguard 0]

This is still an issue. A very important one. Oh yeah, enslave demon break after telling it to attack as well, everytime.