Hello, I am Mateo117, a long time Minecraft player but short time poster.
When I downloaded Beta for my Minecraft (Which I run on a Mac OS-X Leopard 10.5.8), I was excited to get into the game. It patched the files and then went to Mojang Specifications. It stayed on the logo for around five minutes, and I guessed it was still updating. Around 10 minutes I figured I best restart it. When I did, the same issue occurred and I decided to restart my computer. This also failed to change anything, as it simply froze again. I believe it is caused by one of the following issues:
I am on a Mac, and I re-downloaded Minecraft to try and fix the issue with no success.
I left the Minecraft client open during the release of Beta, possibly causing issues.
My computer can have a bad internet connection and may have downloaded the files incorrectly. This of course would have been (or should have been) fixed by me re-downloading Minecraft.
Please, if anyone else has more information or ways to fix this please post below.