It's 16. I found one of the problems. To bring up the File Checker, the right combination is CTRL+ALT+SHFT+Back arrow. I found the fix file info at the customer help site for FTM 16. I ran the checker, and then opened the fixed file, and I don't know what was fixed, but not the master sources. I compacted the file, but it didn't solve the problem either. There are still three copies of each master source, as far as I can tell, and I have about 300 sources, so it's a major job. Maybe I'll just leave them and delete the extras for each one as I use them again. Do you think that all these copies increases my file size by much?