There is also thread on BF forum about this, it seems something changed and people get more and more unmatched bets in running. It could be that liquidity is lower due to Premium Charge, but it could be something else as well. Does anyone else have this problem?
Don't know if you're referring to horse racing but I've found that the liquidity has really picked up in the last couple of weeks and fewer of my in-running bets have not been matched....