Chris, I am unaware of any cases of MFP 7 users getting such an e-mail from BetFair. Yes indeed, the monitor was not functioning 10% correctly in the older version, that is why it has been reworked completely.
If it did not show you that you were liable to charges, then you were not. Be guided by the bar in the bottom of its window - if it is in the red, then you're in trouble, otherwise you should not worry, UNLESS you are running more than one copy of MF Pro, or having the site connected at the same time, or another bot.