A few things. When I had a loose boot this is exactly the problem I had, going from toe side to heel side resulted in dead foot. Initiate a turn and nothing happens. I don't want to panic then catch and edge, so there is hesitation there and a stall. So make sure you don't have heel lift (which because your heel is lifted, when you go to heel side, all you do really is put your heel back where it belongs, so nothing happens).
Second, check stance and angles. When I moved my stance just a tiny bit wider this past weekend, it was crazy, I couldn't turn for squat. And I'm talking just a few centimeters out each way. At the same time I also opened up my stance a little more. Not sure which one caused the problems, but I moved both back immediately, and was able to ride again. Crazy how the most minute adjustments affect you.
Third it might be the board/length, so you might have to just get used to it.