Game Maker Rumors and Myths, Get your Rumors and Myths solved here!

I believe this may have happened to me: Can a GM save file ever lose data registrations such as variables or accidentally reset them to a value of zero?

Sometimes, though, people make games that connect to a database or a server. De-compiling allows people to break into these games and change the code, and change stats and speed to abnormal amounts on faulty programmed games.

This is unwanted, as some people actually take the time to play normally, and see others max out stats or items in little to no time.

500th post. In a Game Maker Topic. =P

No. I believe that a Save State is a Save of the RAM used for the Game at the time, which isn't a very good idea if you want your Save Files to be Forward Compatible.

Like people were doing with Diablo 2.

Also, if you made them have a Save State to their Computer, they could go into that and woohoo! Easy RAM Hacking!

So I, presume that it is relatively easy to modify a GM game?

Yes, although not many people know HOW to modify RAM, even if it is saved to a file.

I doubt anyone would care about RAM and rather extract the game source instead

Mplay - should I use it? Should I use it for Super Karate Mario?

Unlikely unless you really care/ want it.