Continuing the discussion from Not being able to select bones in weight paint mode:
I am making a rigged character, and I was making the weight painting without problems, but accidentally (I don’t know how it happened) I wasn’t able to select my bones anymore, while having rig and mesh selected in weight paint mode. I started searching like crazy for a solution, but nothing helped because everything seemed to be alright.
Then, I compared my rig to another one I made previously, and I discovered I had the “Deform” tab unchecked in the Bone Properties section. I checked it again and suddenly my bone selection worked again 
Hope this helps someone! (I got really scared, and I didn’t want to select everything from the vertex group tab).
