Another boob on my part. I'm obviously running at a higher level of stress than I should be...
I'd been trying to get a sensible set of rules to make selection easier (and failed, by the way), and had tried 'any condition' instead of 'all conditions' - that was where the dodgy selection happened.
I'm having the same issues with selection as I was having with the triggers, one of not being able to match win & place markets. In this case I want win & place selections where the place market has 3 runners; obviously setting a rule for 3 places immediately discounts all the win markets. My strategy requires info from both to work.
I don't know if it's just me that falls foul of these restrictions, but it would be nice if MF had a better way of linking the two related markets together in general. I currently have five profiles running simultaneously (most in test) and expect to be adding more. I have no idea if BetFair will object soon, but I will be doing plenty of calls to the API that wouldn't be necessary if these would run happily together in one session.
Perhaps they can, and it's just my lack of MF experience so far that stops me accomplishing it.