With regards to problem one, the test dir and crashing syncthing.
I tried deleting the empty test dir in ~, then starting syncthing. it creates a new copy of the test folder, then dies. Attached are my local device logs.panic-20180615-141939.log (93.3 KB)
Perhaps there is a bug creating and syncing a new emty folder, or a bug which cant handle a folder called test?