Lewa_Kieteh

I am having the same issue. I'm assuming you have an Intel GPU? This seems to be a common problem with the intel gpu's not being compatible with the current rendering formats of forge and minecraft in general (which is why you crash while going fullscreen) I do not know the solution other than using your default launcher and creating a separate folder in the .minecraft folder and creating a separate profile. i.e. .minecraft/ (new folder)1.7.10/ (new folder)Modpackname/ (new folder)mods Put the mods in the newly created mods folder and put any other files in their respective spots in the modpack folder. also put the directory into the new profile. i.e. add /[version]/[modpackFolderName] after minecraft when you create and edit the new profile. You don't have to create or list the version profile, though it helps keep things organized. you can go a step further by adding them to a subfolder, like Vanilla, Forge, or Optifine. i.e.: .minecraft/Forge/1.6.4/Pixelmon .minecraft/Optifine/1.7.4 or .minecraft/Vanilla/1.8 Not sure if this helps, but that's how I evade the problem. you will still need to use -Dforge.forceNoStencil=true