Word Pad pops up a dialog indicating that Marvin OLE Server is not responding while inserting a new Marvin Document, or editing an existing one with MarvinSketch. This causes no harm or data loss, it is an invalid error message fired by Word Pad. After you complete the drawing process, and close MarvinSketch, press Retry to close the dialog.
Although Open Office is not supported, this OLE solution works partially on that platform.
The following issues are known:
Copying from Open Office into Marvin does not work.
The image of the embedded structure is not refreshed after editing without saving the whole office document.