So far today while trading horses I got 10-15 bet in progress errors. I managed to make profit anyway, lucky me :)  But as I said in my previous posts, trading these days is more like gambling for me.
Kelso 3.35 race was the worst one. I had to check Betfair's web interface but even there in my web browser I could not see my current position in the market. I could see bets matched in My Bets tab but P&L not updated, showing 0. It took about 2 mins, it was Ok later.