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I'm currently using 1.5.1. Logged out to compress a texture pack I've been working on, put it in the texture pack folder in place of the old version of the pack, then tried to login and it just showed a black screen for about 20-30 seconds, then the crash screen. All I've got for mods is mcpatcher, and that hasn't caused any issues for me since 1.3. I went in, deleted the META INF folder, and it still crashed. Anyone know what's going on?

---- Minecraft Crash Report ----
// I feel sad now

Time: 3/27/13 5:52 PM
Description: Failed to start game

java.lang.IllegalArgumentException: Empty region!
at javax.imageio.ImageReader.computeRegions(ImageReader.java:2689)
at com.sun.imageio.plugins.wbmp.WBMPImageReader.read(WBMPImageReader.java:184)
at javax.imageio.ImageIO.read(ImageIO.java:1422)
at javax.imageio.ImageIO.read(ImageIO.java:1326)
at bjq.g(SourceFile:44)
at bjq.<init>(SourceFile:29)
at bjs.<init>(SourceFile:13)
at bjv.c(SourceFile:114)
at bjv.<init>(SourceFile:37)
at net.minecraft.client.Minecraft.a(SourceFile:244)
at avv.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:507)
at java.lang.Thread.run(Thread.java:680)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_43, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 501320064 bytes (478 MB) / 534708224 bytes (509 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: NVIDIA GeForce 320M OpenGL Engine GL version 2.1 NVIDIA-1.6.36, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Wayukian_pack_v6.0.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

So it turns out that my pack.png file was corrupted & causing the crash. I feel stupid haha. If any other texturers run into the same issue, it's probably just a bad file.