Alright this bug is pretty simple and isn't a massive issue but i have had this before when i have been modding the main menu and changed a few GL11 methods.
So basically if you go onto multiplayer and hover over the 'ping' server area and press escape (takes you back to main menu) the main-menu will go darker and have no panorama.
I believe its some sort of GL issue doing this.
I have attached an image of what the main-menu looks like.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt) here.and
Please attach the complete output of the "Development console" tab of the launcher.
Click the text, press CTRL-A to select all, then CTRL-C to copy, and CTRL-V to paste in a comment on this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".