Dangling dimensions on drawing update

When updating a drawing after prompted by ZW3D:

image

The drawing goes from this:
image

To this:
image

Any idea what causes these dangling dimensions or why it trashes all my hole tables and other dimensions?

Sorry for the late reply.
In my experience there is something in the parent model that is rebuilding. refreshing and assigning new references. Then the drawing cannot find the references.
If you have errors in the model, or any part of the model this problema can occur.
Fix the errors or loops and it should work OK, hopefully.
Cheers- Paul