Reviving an older thread…
SimpleNote sync has absolutely stopped working for me since the past 4-5 months; it used to work just fine and dependably - just as long of course as one doesn’t expect notes to sync right away, as @PaulWalters mentioned.
For me though, a complete standstill. Tried creating new test docs and so on. Tinderbox generates the requisite “SimpleNote” Note, but it never becomes a container. My existing tinderbox files that used to merrily sync are now eerily passive, unsyncing.
(tried with v.7.5.6, v.8.0.1, and v.8.0.4)