Previous post made me think I should have mentioned filling. I too have the newest 4.3 version. Filling requires snugging up a nipple top bottle to the fill hole. Don't squeeze too hard or you'll force your wick from the juice channels. I barely squeeze taking at least 30 seconds to fill. Just be extremely patient and use a bit of care. That might explain your leaking problem also. Pushing too hard, trying to fill too fast, and you'll push the wick out of the juice channels for sure.
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Come to think about it: "pushing the wick out of the juice channels" is a good thing in my book because I don't want any of the wick in my juice channels at all
