OK, thanks for the response. I guess there are two potential views on this setting:

1) Functionality that has been deprecated (or changed) in a newer version will be reverted back to working in the compatibility mode version.

2) Functionality of a given version in compatibility mode will actually function like that version.

I guess I would expect it to function more like a Microsoft Office program. When you save a document in Office 2003 Compatibility mode all 2007 or above features are removed from the document so the document can be opened successfully by Office 2003.

Mike