MS Project xml import to P6 - file does not appear in EPS

When importing an MS Project .xml into P6 the import indicates 'Process completed with errors.  See log file for details'.  If the log indicates an error, its corrected in the xml file using Notepad++ to remove the code thats responsible for the error (for example bad Resource or Calendar code, etc), this has been done many times successfully as I understand html coding enough not to jeopardize the files integrity.  The same happens on a test xml with a few tasks added and tied, so no inherent code issues. Now I get the same import result message, however the log