My game crashed when i tryed to open a toolbox that contained a Forestry Backpack (It was ok when i insert it on the toolbox).
It may have to do with the backpack Heavy use of NBT Tags or something. Also i dunno if it would happen in 1.9.0 if someone is nice enough to test it thanks.
Edit: Luckly the items inside didnt vanish and my game loaded normally, give me a second and ill provide an error log.
Edit2: It may have to do more with having a full QuickSlot bar rather than a backpack thingy.