I got this error in my game, in the output panel of Chrome:
FBInstant_PlatformSetLeaderboardScoreAsync - error: Game called too many leaderboard APIs too quickly. Reduce the rate of requests in order to avoid being rate-limited.
I send two saves and one load after each game play, so not overly excessive. After a lot of googling I can’t find the actual limits. Does anyone know?
Also, when it fails there is no Lua error and the callback is never called.