Workaround:
If you have not used layers in your MacDraw Pro document you can save to PICT format (Copy and Paste will not work nor will saving to MacDraw II format).
Caption vs. Paragraph Text Block:
A Caption Text Block is created when you click your mouse with the Text Tool. A Paragraph Text Block is created when you drag with the Text Tool. You can change a Caption into a Paragraph Text Block by selecting it with the Arrow Tool and resizing it.
This issue is resolved in ClarisDraw 1.0v2.