I am a very recent convert to SyncThing and a very happy one as I am also a refugee of Dropbox, so glad that is out of my system.
I am currently running two Macs: a fairly recent MacBook pro running OS X Mojave and a desktop Mac Pro running OS X Sierra. The SyncThing install was from the Syncthing-1.0.0-2.dmg ( v 1.3.4 ).
As I continue to poke around and learn the system I have found something that I am not sure how it was created or how I proceed.
In the Local Host panel > Actions > Settings > Ignored Folders I have found an ignored folder that is located on the laptop from two days ago. I cannot find the file’s ID on that or any of the computers. I also seached the logs with no luck.
I do not remember creating it. It has an unignore option but I am certain what would happen if I did unignore it. After reading a good deal about Ignored files I realize I know less than when I started.