Disappearing Collaboration / Note "bug"
I thought I would mention this, in case another user experienced a similar problem.
Earlier today, I had two Notes against an individual in Family Tree (under Collaboration), but suddenly found one (headed "Children of Robert Hubbard") had disappeared and "in its place" was an updated version of an item I'd just edited, headed "Identity of Robert Hubbard". To clarify, I now had two versions headed "Identity of..." and no note headed "Children of...".
Sorting the problem proved quite simple. The missing "Children of..." item (which I'm sure I hadn't deleted) was in the Change Log. I clicked on "Restore" and it reappeared in the Notes section. At the same time, I found the older version of the note on "Identity of Robert Hubbard" had now disappeared!
This might have been a "one-off", but just a warning not to panic if something similar happens to you. Your work / item has probably not been lost - just waiting in the Change Log to be restored!