sorry for fourth posting in one day

1.) Open a PDF in the viewer
2.) Call >>> CoPDFXCview1.SetDocumentProperty 0, "Pages.Layout", 0, 0
Result: RuntimeError -2113928014

Please try this in some version before:
1.) Open a PDF in the viewer
2.) Call >>> CoPDFXCview1.SetDocumentProperty 0, "Pages.Layout", 0, 0
Result: Document will switch to Single-Layout