Word Pad pops up a dialog indicating that Marvin OLE Server is not responding while inserting a new Marvin Document, or editing an exisiting 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:
copy 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.