If I play using 1.12.2 forge, if I enter and exit fullscreen, the game glitches very bizzarely and may even give people seizures under the right circumstances. I can still interact with the game normally but the screen is still messed up. I removed all of my mods, which didn't help the issue. I can only fix the issue if I use vanilla Minecraft, which I don't want to do since these mods are very useful. Now this shouldn't really matter, but fullscreen can be glitched (not in a graphical way) to afk mine forever, and one of my game directories/installations is stuck in fullscreen (when I open it, it automatically goes to fullscreen). I don't usually use fullscreen because the text gets more in the way using it, making this very annoying.

If everyone else was experiencing this issue, I should have found it online, but found nothing. Please help, if I was prone to seizures I would be in the hospital already.

 

• I can switch between fullscreen and not full screen just fine
• On one of my forge profiles on the launcher, playing on it results in a not full screen mode on launch, on my other profile (using a different directory and txt file, but the same copy of forge), it always launches on fullscreen regardless whether I was on full screen last time or not.
• On both forge profiles, graphical glitches occur when I exit out of fullscreen (but not when the game starts in fullscreen). Imagine if the game is frozen, but not quite frozen. The game mechanics itself are normal (in game screenshots don't show these graphical glitches), but everything's either flashing black or everything's really jittery. Sometimes, I see nothing but the sky in Minecraft (sometimes a black bar-ish shape takes up the entire screen), but I can still see the sun rising. I'll post screenshots of these glitches later.

 

This is still an issue. If it comes to reinstalling forge how do i do so?

Screenshot examples:

• (Game Crashed with no crash report)
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• (This one lasted only a few seconds)