Thank You so much for the kind words!!!
I am very sorry to hear that there is an error when posting scores. Can you please tell me what is the error message (if any)? I also ran through the leaderboard logs and there seems to be an error recorded. If you are able to share the error, I might be able to confirm the issue and fix it.
This is the first time I am seeing an error in the system, it has worked fine for the last 2-3 years lol. Thank you very much for reporting the issue and sorry for the inconvenience.