Hi londolozi,
First of all, I'm sorry for spotting this topic too late.
I have just run several tests with today's football matches to see if MF Pro will detect their going In-Play, and it did.
Although there is a reason why it might not. In the BetFair API we're currently using there is no direct way of determining if a market will go In-Play (odd isn't it), so we have to work around by checking the mentioning of "In-Play" in different variations (In Play, inplay etc.) in the text of the market's description, the one that comes up when you press the Info button.
If for some reason the combination is not found in the text, it is considered that a market will not go In-Play. I guess that's what happened that day, maybe a BetFair operator did not include this in the markets' descriptions.
I'm very sorry if the consequences were negative for you, I'm hopeful that their new API will fix this situation.