Hi,
The in-running market might never have started, or if there is a problem at BF they might stop the market and cancel/delete ALL inrunning bets either matched or unmatched. This happens more often than it should, and there is NO comeback at all from BF, don't bother even trying to pursue the issue.
You will miss out on inrunning prices. It is a fact of life at this stage, for almost everyone. Its either the liquidity is not there or someone else is faster (and there will usually be someone!). It doesn't matter why, its a fact you will miss out sometimes/alot. I will PM you a hint for the time-to-end, albeit its probably fairly well known anyway.