Version 6 SR10
I just realised that this posting is on a Mac forum. I use Windows 10 Pro.
I think that I am encountering the same problem, but it is more widespread. I am using the default Annotation style. I have many dimensions and text blocks, all of which were displayed perfectly until I tried to implement annotation model scaling layout scaling. Having done that, the dimension lines remain visible, but the dimension numbers disappear. The text also disappears. Both are still there, and become momentarily visible after changing the text height to its current value - i.e. over typing its value with the same value. However, when the item, whether a dimension or a text block, is deselected, the number or the text disappears. In the case of a dimension, the arrow remains visible.
Further, I have a closed curve which has become invisible. I can select it by swiping through it, knowing where it should be, and it becomes visible. When it is deselected, it too disappears.
The first image is after using Zoom Extents. It knows that there is a text object at the top, and includes it in the view, even though it is not visible.
The second image shows that the invisible text object can be selected.
The video shows the text appearing after over typing its height to its existing value. It disappears again when tabbing out of the text height field. It also shows the problem with the closed curve and a dimensiion number.