It wasn't just one race it happened on. The issue was happening for an hour or more.
It wasn't on all bets. For me there were periods where it was others where it was fine others where some went in some didn't (appear to).
It was backs and lays.
It was polling and streaming.
It affected all customers around the world on all markets.
It appeared bets weren't being placed or appeared and almost instantly vanished.
The bets would then re-appear some time later. But it was only then that they seemed to enter the system and potentially be matched, but for example place a bet pre-race it could show up inplay.
The issue happened on both the API and website.
It has been seen before, at least on UK markets.
The API status page showed no issues.
Betfair took a long time to post anything about there being issues on Twitter.
I hope the losses weren't to bad, at elast it sounds like you were limited to one race.