Fatal error - IllegalArgumentException
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Hey, everyone! 
After I log in using the World of Minecraft client, I can connect to and load whichever server I want. As soon as I try to look around or move, though, the game locks up and I receive the following in the terminal window that launched the client...
I've tried this running Java 6 and Java 7. OS is Lubuntu 13.04. Anyone else experience this problem?
java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.TimSort.mergeHi(TimSort.java:868)
at java.util.TimSort.mergeAt(TimSort.java:485)
at java.util.TimSort.mergeForceCollapse(TimSort.java:426)
at java.util.TimSort.sort(TimSort.java:223)
at java.util.TimSort.sort(TimSort.java:173)
at java.util.Arrays.sort(Arrays.java:659)
at java.util.Collections.sort(Collections.java:217)
at com.mojang.minecraft.l.run(Unknown Source)
at java.lang.Thread.run(Thread.java:724)