After switching to the resource pack Simplify, launching the game, entering or exiting a world results in a crash.
What I expected to happen was...:
In case a: The world loads.
In cases b and c: The main menu loads.
What actually happened was...:
In all three cases: the game crashes with a crash report like that in the attached text file.
Update: The case a crash no longer occurs in Minecraft 1.6.2.
As a workaround to case c, move or remove Simplify before launching the game. Minecraft will revert to the default pack.
Steps to Reproduce:
Download Simplify and place it into the .minecraft/resourcepacks folder.
Note that the zipped version does not appear in the resource packs list.
Unzip Simplify into the .minecraft/resourcepacks folder.
Note that it shows up now.
Switch to Simplify.
There are at least three ways to reproduce this:
Case a: Try to enter a singleplayer world or multiplayer server.
Case b: Try to exit the current world (press "Escape", click "Save and Quit to Title" or "Disconnect").
Case c: Quit Minecraft and launch it again (click the "Play" button in the MinecraftDev launcher). In this case, the crash occurs after the Mojang logo is displayed.
Related issues
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I repeat: This is not a duplicate of MC-17831 and is still present in 13w25a.
Note:
Description: Updating screen events
java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Random.java:250)
at bkp.<init>(SourceFile:92)
at avn.a(SourceFile:48)
at avt.a(SourceFile:71)
at avt.d(SourceFile:125)
at avt.m(SourceFile:109)
at atl.k(SourceFile:1148)
at atl.S(SourceFile:650)
at atl.d(SourceFile:606)

Is this still an issue in the current snapshot ?
Yes.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Case a seems to have been fixed, the other two still apply.
I have now noticed that the crash does not occur with another resource pack (oCd).

Cannot reproduce.
The resource pack seems to be so broken that it won't show up in the selection, see screenshot.
If you unzip the resource pack, it will show up. I have changed the description accordingly. Please reopen.

Your resource pack is borken.assets/minecraft/texts/splashes.txt
is empty. Dont't do that.