I have this exact same issue... It finishes loading, but then it locks up at "Awaiting Snapshot..."
It's USUALLY (but not always) ok when I first join a server, but then I can count on having issues as soon as the map cycles. Hell, I've found it quicker to leave the game and rejoin after the map's done switching.
Sometimes, it will recover and actually let me continue playing after 3-5 minutes of sitting there. I notice that my hard drive is constantly active during this time. What the heck could it be doing? It's already done loading, and it doesn't ALWAYS have to take another 5 minutes. Sometimes (albeit rare) it'll finish loading and start immediately.
I CAN escape the problem when it locks up. I'm usually able to pull up task manager and close the game manually. By the way, everything on the screen gets really bright because the game changes your display's gamma correction. The reason it stays bright is because if the game crashes, it doesn't change it back. I find myself running the game windowed most of the time so it's easier to cut it off in task manager when it freezes (and it will).
1.3 GHz AMD Athlon Thunderbird
GeForce3 Ti 200 64MB AGP
I turned on the framerate counter (use the console command "cg_drawfps 1"), and in 1024x768x32 with all other graphics settings at max, I get regular framerates of 70+ with Quincunx antialiasing and 8X anisotropic filtering.
It's not a performance issue that causes it to lock up, that's for sure. The game runs like a dream once it gets going. I did e-mail tech support about this. It's been 2 weeks, and they haven't responded. Makes me want to sue... They guarantee 72 hours or less up front. This is really making me mad.
I hope they make a patch pretty soon. There are plenty of issues for them to fix. This is one. Then we have the glitch where you can't get the force powers you want the first time you spawn in a game. There are various problems with the interface in the "Join Server" screen. The multiplayer interface needs work... Game hosts are forced to either call votes or use the console to put in regular, every-day admin commands.
But you know, I'd put up with all the other issues for now if I could just successfully get into a game after a map cycles before someone's already scored 7 kills.....