Since the 1.4.6 prerelease, I'll attack a skeleton, or will have one on my screen, and the game will crash, leaving me with the following error. I've also uploaded the actual crash text file.

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Ticking entity

A full error report has been saved to C:\Users\user\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-17_19.33.17-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

— BEGIN ERROR REPORT ef0bd2c5 --------
Full report at:
C:\Users\user\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-17_19.33.17-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 12/17/12 7:33 PM

– Head –
Stacktrace:
at qz.j_(SourceFile:276)
at yc.a(SourceFile:1319)
at in.a(SourceFile:450)
at yc.g(SourceFile:1297)

– Entity being ticked –
Details:
Entity Type: Arrow (qz)
Entity ID: 700
Name: arrow
Exact location: -373.41, 60.01, 303.88
Block location: World: (-374,60,303), Chunk: (at 10,3,15 in -24,18; contains blocks -384,0,288 to -369,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Momentum: 1.14, -0.30, 1.15
Stacktrace:
at yc.h(SourceFile:1196)
at in.h(SourceFile:362)

– Affected level –
Details:
Level name: Josh's World
All players: 1 total; [iq['drummerboy0511'/260, l='Josh's World', x=-372.43, y=58.00, z=305.19]]
Chunk stats: ServerChunkCache: 726 Drop: 0
Level seed: 693005418
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-264,64,328), Chunk: (at 8,4,8 in -17,20; contains blocks -272,0,320 to -257,255,335), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 1054533 game time, 1186536 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 98202 (now: false), thunder time: 67259 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:744)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)

– System Details –
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 386134448 bytes (368 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 4608 (258048 bytes; 0 MB) allocated, 4113 (230328 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1194 (66864 bytes; 0 MB) allocated, 1153 (64568 bytes; 0 MB) used
Player Count: 1 / 8; [iq['drummerboy0511'/260, l='Josh's World', x=-372.43, y=58.00, z=305.19]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.ClassCastException: qn cannot be cast to iq
at qz.j_(SourceFile:276)
at yc.a(SourceFile:1319)
at in.a(SourceFile:450)
at yc.g(SourceFile:1297)
at yc.h(SourceFile:1196)
at in.h(SourceFile:362)
at net.minecraft.server.MinecraftServer.r(SourceFile:744)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)
— END ERROR REPORT a7983f68 ----------