I am also using Family Tree Maker for Mac. Knock on wood - have not had any major problems yet. I keep getting updates to the software - averaging a new one, once or twice a week since I bought a month ago. I successfully uploaded my tree to Ancestry, but have not tried a download yet. Anyone tried that yet? I'm a little timid to try that. Will do backups, of course, but just wondering how things turn out?
MABethel