The only thing I can think of on the textures thing is that either you accidentally misplaced or deleted a file or it could be a glitch in the game. If it's a glitch, try changing your video rendering system and restarting.
And I don't really know if McAfee would be an issue, unless you have a firewall up, so I would check that too.
And also, are you waiting 30-60 seconds after logging in? A lot of times it won't connect if you don't wait. And the best browser to use with it is either Chrome or Firefox. It may also help to use a url refreshing plugin or site(I use Refreshthis.com)
Sorry if this all seems confusing. ^^' Not too good at explaining things yet.