Minecraft Forums

Hi, my name is mrtofugu101. I am posting because of an issue with my brother's account, Reecepiece1018. It recently has started last week ago when my brother's minecraft screen was frozen, only displaying the loading screen with the mojang logo. We both share the computer but we have separate accounts. We never bothered trying to fix it until now, since we were busy with school and work. Looking at the issue today, we first thought it was a wi-fi issue but that wasn't the case, as our wi-fi was still strong. Second, we thought that our java was not currently updated. I reinstalled java version 7 update 21 on my computer, and tried to run it, but it resulted in the same freezing screen that our previous attempts caused. We then tried to force update, but no effect. I have repeated to process of force updating the account, but still no effect. I then read an article I found here about updating the lwjgl, and I downloaded the auto updater found on the forums. As soon as it updated, we tried to log in again, but it still kept freezing at the Mojang Screen. My final attempt was to reinstall minecraft itself, but once again, no effect. Until then I have not seen any other way to fix this. What I have discovered is that the issue keeps happening on MY BROTHER'S account only. When using MY account, I was able to get on minecraft with only partial slowness, but nonetheless the same efficiency as before. My brother is also able to play offline on minecraft. Has anyone else had this problem? Can anyone help me? Thank you.

Important information:
-Our computer is a Macbook Air with OS X version 10.7.4 with a processor of a 1.6 GHz Intel Core 2 Duo and a memory of 4 GB 1067 MHz DDR3. Our Startup Disk is the Macintosh HD.
-Our java is version 7 update 21
-Our Minecraft is 1.5.2
-The version of the lwjgl is 2.9.0
-Minecraft works for my account (IGN-mrtofugu101), But doesn't work on my brother's account (IGN-Reecepiece1018).
-Our Wi-Fi Company is comcast.