System lockup

I downloaded the new update & now game will load, but as soon as the white bar fills, the music starts to falter & repeat itself at a fast rate. Then my PC locks up, & I can't even load the Task Manager. After about 5 minutes I can "x" out of the load & launcher screens. Oh yeah, after update the game loaded into the "Winter Melt" map, & it played fine for 20 minutes. The problem started when I "timed out" between games & then tried to re-join. I also tried completely exiting & re-entering the game with the same result. Any suggestions for a fix would be appreciated. (I played the game without any problems for an hour yesterday before the update).
 
Thanks for all the input. I was looking at some of the fixes for other situations, & tried the deleting the "preferences" folder. Game works fine now. Thanks again-
 
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