So I popped open GameMaker Studio and... disaster!
Yoyogames, the developer behind the program has been updating the program, and breaking it as well. This is probably a way to try and force people to buy the newer GM:S 2.
I simply couldn't use the newer 1.4.1804 version of GM: S, but thanks to some help, I was able to reget an older functional version of it on Steam and have made a backup of it.
Now I can resume Drop Factor (new name for my current game project).
Time to really push myself back into this!