Day 73: Jumping for Joy! ...wait

I finally remembered to put my own game into my Dropbox account! (Huzzah!) Finally I can work on getting the slopes integrated into the main game... although there is a slight problem; my jumping still is broken, and I cannot understand why. Currently when I try to jump, it just doesn't work at all... that's how much progress I have made so far. Previously it would cause the player to hover midair as long as the player was moving left or right. Once the player stopped, then the jump would continue. Through some attempts at fixing it, I have even made it so that the player can't move at all. Or other times, where the player can move, just as long as it is through the air while jumping or falling.  I have tried everything, from changing the way the player jumps, to changing how gravity works in the game. I've even tried only allowing gravity to have effect if certain conditions are met, which still isn't working. Here are a few examples of what  I'm trying to use to fix this:

Changing the way the player jumps:
- Changing the vspeed of the player to go in an upward direction and reducing it with gravity
- Using move_contact_solid (90,15) to move the player in an upward motion
- Attempting to change the y position of the player using y-=(n)

How gravity works and affects the player:
- Only allow gravity to have effect if the player is in the air/not in contact with anything else but the floor(using: if !place_meeting(x,y,par_Wall){gravity=1}else{gravity=0}
- Make gravity in a different way: move_contact_solid (270,15) ;
vspeed=15;

With gravity in effect on its own, my movement code doesn't work. I am trying to find a way to correct this but alas, nothing is working. Instead of using hspeed and vspeed, I am using x+=(n) and such to move around. They are essentially the same code, just slightly different in the way they work. Gravity and hspeed work fine together, but hspeed and slopes do not. However, slopes and x+=(n) work amazingly together, although x+=(n) and gravity do not. Of the three nice things, it would seem you can only pick two in this case. I think it is just a matter of getting a gravity setting in place, or something that will change gravity properly based on whether or not the player is colliding with the floor. Next class I will try my best to come up with a better system for this. Obviously the "if !place_meeting" idea isn't working too well, so I will have to come up with something else. I might end up playing with custom variables to detect when the player is in air and when they are on the ground, changing it based on if they hit the ground or hit the jump key. I am hopeful here, but I don't think it is going to be quite so simple.