Using Adobe Acrobat XI 11.0.23 (Acrobat, not Reader), our PowerBuilder 12.5 application hangs for 8-10 seconds when an OLE PDF window is closed. The same delay is seen with Reader DC 17.012.20093 and all subsequent versions but is not seen with Reader DC 17.009.20058 and older, or Reader XI 11.0.23 and older.

There seems to be some delay in the destruction of the OLE PDF viewer object; the delay can even be seen when closing a window containing an OLE PDF viewer from PowerBuilder 12.5 IDE.