Hello all, I've had this problem for about a month now. When I start my Minecraft I click, "yes," to update. It goes to about 10%, then stops and says "Failed to launch,' under that it says "Fatal error occured (4): null." When I click "no" instead it shows the update screen, goes to 100% and just sits there, nothing else happens. I have Avira and K9 Web Protection. I read on another topic on here that the problem is when your game client tries to update, something is blocking the update path. Is this true?
A little more than a month ago my Minecraft worked perfectly fine, then I don't know what happened. I assume a new update came out, or my firewall updated without telling me. I've done some research and have tried everything I've found. I have tried deleting my bin folder, deleting my .minecraft and everything Minecraft-related except my copied maps and tried to start completely over. That has not worked so far. I read Minecraft updates come from "s3.amazonaws.com", is this true? If so, I have completely disabled Avira, and have allowed that site on K9, tried to update and the same thing happens.
What am I doing wrong here? Have I forgotten to do something? Am I doing it wrong? Any and all help and responses are greatly appreciated, thanks.
P.S. I had single-player commands, Too-Many-Items and Zen's Minimap Mod (either Zens or Rens, I don't really remember the name) installed if that helps, but again, I didn't change anything, this just happened.