Hi,
Well, reverting back old versions is not a good idea, as newver versions may change the database structure/add new entries, for which older versions are not ready of course.
I think, the cleanest approach would be to completely wipe the plugin, and re-configure it again, to make sure all the data is consistent, since the reverts must have messed up something with the data, and probably causing the issues with the saves.
I recommend these steps:
– Wiping the plugin following these instructions
– Installing the most recent version (4.7.12)
– Then configuring it on the back-end
– Then clearing all layers of cache, including site cache, browser cache etc.. so that the changes populate