Hi Allin and other contributors to gretl, I found a strange behavior of gretl. If the .gdt data file had an “&” in the file name, once I open it, save some models in the session, and then save the session as .gretl file, I can’t open it later. The error message reads "xmlReadFile failed on /Users/fred/.gretl/.test/session.xml" The same dataset without the “&” in the file name is fine. Fred