There could be many reasons why a preset is making your game crash.
1(st)- Did you delete a file in your presets folder called a .material? That file is needed for a preset to work.
2(nd)- Make sure you saved the preset so it matches the format in the material file! For example, it will say something similar to this:
texture preset_3body.jpg
That means you must save it as a .jpg!
3(rd)- If you did add an effect using the material file, make sure your scripts are all correct.