Personally, I quit my browser instead of teleporting to Nexus. There is always a slight delay when you hit the Nexus button before you teleport to Nexus, and you can get killed. Just hit Command+Q and you shall be safe super fast.
@John986: You can buy the classes permanently for an okay price (not real money). Besides, the classes randomly lock and unlock. I like this game, its really fun. If you don't, stop playing.
Favela is completely unbalanced. The blue team never stands a chance, because the red team has all of the advantages. Worst map yet, but with plenty of potential.
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It's not random right now. They rotate according to a plan. There is always a Light, a Heavy, a Striker, and a Utility chassis class.