Oh god not again.
I just tested my GUI update for my texture pack, and much like last time, my screen flashed on and off, but this time only once or twice, and it was a much longer time after I had walked up from my underground bedroom -- I was outside looking in the direction of my cave wanting to refill my supply of coal. I had installed modloader and the pokeball mod but they worked fine on my test world, and on my main world all this glitchiness didn't happen until after I turned monsters on when monsters didn't do anything in my test world.
And not only Minecraft was affected, my entire screen was screwed up. My n's turned to this weird unknown symbol, the caption bar of Minecraft disappeared, the applications and logout button were broke, and the computer was ultimately frozen, promting me to restart yet again.
I apologize in advance for the crappy quality of my cellphone.

NO BAR.

Screwed applications menu.

Screwed logout button.

Those p looking things are supposed to be n's.
I don't know what's happening :C