Seems to be a similar problem to how-do-i-fix-this-jumping-motion_t108943
I can't jump past an invisible wall, which only exists when I make sprites invisible.
See pic: https://www.dropbox.com/s/9nvx7218wne59 ... e.JPG?dl=0
As you can see in the comparison between invisible and visible sprites, the invisible wall (where the red line is at ) isn't an object so it shouldn't be there. Is it a Y vector thing?