The fall through the ground seems to be fixed, even at higher gravity: awesome!
The jump off slopes sometimes jumps full height, sometimes doesn't. Remember to hold right while you jump, even if you let go after (so that you're running down the slope while you jump).
The rubber banding on the moving slope to the left still remains.
Sidenote: the line near the bottom of the code should be changed to this, to see the max height jumped properly:
context->DrawText("Max jump height: " + String(maxheight-startheight), 10, 30);