Using latest v10.6, was working in v9.x (January 2011) - just upgraded.
Converting HTML to RTF and getting an exception on the line in red:
DocumentBuilder builder = new DocumentBuilder();
builder.InsertHtml(html);
string sTempFilename = AdeptUtilities.FileUtil.GetTempFilename("rtf", AO.Image_Folder_ThisUser, "rtf");
RtfSaveOptions oRTFSaveOptions = new RtfSaveOptions();
oRTFSaveOptions.ExportImagesForOldReaders = true;
builder.Document.Save(sTempFilename, oRTFSaveOptions);
HTML:
<div><p style="margin: 0pt;"><span style="font-family: "Times New Roman"; font-size: 12pt;">asdjfkjsldkjfklsjdlkfjlaksjdflkjoiwreuioruiower </span><img alt="" src="http://localhost/AdeptExplorer8.4.2/tmp/23be9c4a-840e-4d67-bae1-a1f006a208a5/Aspose.Words.b9f8c915-e5ff-4256-ab87-37ca349dc033.001.jpeg" width="16" height="16"></p><p style="margin: 0pt;"><br style="clear: both; page-break-before: always;"></p><p style="margin: 0pt 0pt 14pt;"><span style="font-family: "Times New Roman"; font-size: 12pt;"> </span><img alt="" src="http://localhost/AdeptExplorer8.4.2/tmp/23be9c4a-840e-4d67-bae1-a1f006a208a5/Aspose.Words.b9f8c915-e5ff-4256-ab87-37ca349dc033.002.png" width="225" height="72"></p><p style="margin: 0pt 0pt 14pt;"><span style="font-family: "Times New Roman"; font-size: 12pt;"> </span></p><p style="margin: 0pt 0pt 14pt;"><span style="font-family: "Times New Roman"; font-size: 12pt;"> </span></p><p style="margin: 0pt 0pt 14pt;"><span style="font-family: "Times New Roman"; font-size: 12pt;"> </span></p></div></div>