I maximized the game window right when minecraft was switching between the "building world" screen and the actual world, and this happened. (images below). Returning to the main menu does not fix it. I didn't try resizing the window, but quitting and restarting works. Also, everything else works fine, it just seems to be a rendering issue. No crash log, because no crash.
It is running forge, but i checked and it did it in vanilla as well.
No big deal, but I thought I'd report it anyhow.
MC-36079
Game rendering in maximized window on world load
Resolved
Duplicate
0
Graham Grasley
(Unassigned)
Unconfirmed
maximize, rendering, window, world
Minecraft 1.6.4
Retrieved
I think that this may not be a minecraft glitch, but a lwjgl glitch. I have seen a similar report and this, to the best of my memory, was one of the responses,