Using the new launcher, and launching Minecraft 1.12.2, the game will start up fine as long as it wasn't in full screen mode the last time it was used. Once i try to switch it to full screen, however, whether through the F11 key or through the options menu, the game immediately crashes. The following appears in the log:
21:15:17 bib Couldn't toggle fullscreen org.lwjgl.LWJGLException: Failed to set display mode (-2). at
org.lwjgl.opengl.WindowsDisplay.nSwitchDisplayMode(Native Method) at org.lwjgl.opengl.WindowsDisplay.switchDisplayMode(WindowsDisplay.java:358) at org.lwjgl.opengl.Display.switchDisplayMode(Display.java:359) at org.lwjgl.opengl.Display.setDisplayModeAndFullscreenInternal(Display.java:507) at org.lwjgl.opengl.Display.setFullscreen(Display.java:475) at bib.r(SourceFile:1556) at bib.W(SourceFile:2919) at bib.aD(SourceFile:1756) at bib.t(SourceFile:1665) at bib.az(SourceFile:1000) at bib.a(SourceFile:419) at net.minecraft.client.main.Main.main(SourceFile:123)
21:15:18 bib Unreported exception thrown! java.lang.IllegalStateException: Keyboard must be created before you can read events
at org.lwjgl.input.Keyboard.next(Keyboard.java:475) at bib.aD(SourceFile:1740) at bib.t(SourceFile:1665) at bib.az(SourceFile:1000) at bib.a(SourceFile:419) at net.minecraft.client.main.Main.main(SourceFile:123)
Changing my screen resolution seems to have solved the issue.
i was running at 1768 x 992, which made the text on my screen a bit more readable. Now that I've changed to 1920 x 1080 (which Windows 10 has marked as "recommended"), I was able to take Minecraft into full screen mode using the F11 key with no adverse repercussions.
I'm using an HDMI cable to connect my system to an HD TV, which is why my text is not as sharp as it would be with a standard monitor.
I don't know why I didn't try this ages ago!
If anyone has any info regarding why the resolution makes a difference, I'd be most interested to hear it.
i changed the resolution to a 1280x720 then back to a higher setting and windows told me it has some features blocked by a firewall i gave minecraft access no issues now nothing else installed nothing no work arounds other then that just a firewall issue