We went from 2.0.6 to 2.1.0 to reflect the introduction of real-time preview.
2.1.1 had a bug that could cause it not to launch: https://forum.audacityteam.org/t/fix-for-audacity-2-1-1-not-launching/39157/1 You were likely not helping by moving Audacity.app from its folder. We do not recommend doing that.
If you want to test our current code then please use the latest nightly build from the top of http://www.audacity.homerow.net/index.php?dir=mac/&sort=date&order=desc. Whatever is the latest build there will become 2.1.2 RC2 when the time comes. There is no point testing old releases.
If some old audacity.cfg file creates a problem in the latest nightly build, then please attach the .cfg file.Please see here for how to attach files: https://forum.audacityteam.org/t/how-to-attach-files-to-forum-posts/24026/1
Gale