This is growing like crazy (which is why I suspect it's invasive) in and at the edge of the woods around here. It can get some really huge leaves that shade out everything else, though it's not vining. (The honeysuckle is taking care of everything that grows vertically.)
It reminds me of something we called skunk cabbage when I was a child, but it doesn't stink when a leaf is broken.
"No" to both questions, sallyg. I keep forgetting to take my camera with me which is why I brought back one of the mature leaves to photo. The younger plants have more rounded leaves. The get more elongated like this one, and pretty thick and tough.
I don't think it's Arcticum, VV. I can't remember seeing stalks or flowers on it, and there is no evidence now that it previously had any... it grows low to the ground and the leaves become very thick and large.