Damn I haven't logged in here in ages! Sorry for the late reply.
Just in case anybody still find this: yes, I've had the same problems. Sometimes scores can take up to an hour to update, or never show up at all. Unfortunately there's nothing I can do about it... sometimes the Playtomic servers are going to be slow or offline completely - it happens to every online system.
Including fallback logic for when the scores don't load is a great idea!