Sorry in advance for asking something so simple as well as for possibly posting this in the wrong forum.
I decided recently to try making a game with an old copy of MMF2D I got like 5 years ago. I'm making a game with several genre elements including platforming, but I can't figure out how to make my Active character jump. I tried setting the controls to the default Up+Left/Right option, which allows me to make my character bounce left and right in succession like a ball, but whenever I try to just jump straight up, I get no response; the Active character won't move until I hit Left or Right, at which point said character resumes left-or-right-but-never-straight-up bouncing.
What am I doing wrong?

