Bug: Graph in layout can become tiny

This problem appears in Prism Mac 6.0b to 6.0g. Prism Mac only; the problem is not in Prism Windows. 

The problem occurs only when you do this series of steps, so occurs very rarely:

• Create a project with a layout with a placeholder that is not assigned a graph.
• Save then reopen that project. 
• Assign a graph from another project to that placeholder. 
• Save then reopen the project. 

Now you see that the graph becomes tiny, but can be stretched.

To avoid this problem, only assign graphs from another project to layout placeholders created in this session of Prism. Don't save projects with placeholders, then open the file and assign a graph from another project.