Upon resizing the window within a Mac, the game does not properly recalculate the positions of the buttons/etc, resulting in a "framed" appearance. After a few moments, the game crashes, leaving this log:

http://pastebin.com/MSnfhGC4

Client> 2013-04-18 21:21:11 [CLIENT] [INFO] LWJGL Version: 2.9.0
Client>
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client> (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client>
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/lava_flow.txt
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/water_flow.txt
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/fire_0.txt
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/fire_1.txt
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/lava.txt
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/portal.txt
Client> 2013-04-18 21:21:13 [CLIENT] [INFO] Found animation info for: textures/blocks/water.txt
Client> 2013-04-18 21:21:14 [CLIENT] [INFO] Found animation info for: textures/items/clock.txt
Client> 2013-04-18 21:21:14 [CLIENT] [INFO] Found animation info for: textures/items/compass.txt
Client> java.io.FileNotFoundException: http://assets.minecraft.net/1_6_has_been_released.flag
Client> at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1434)
Client> at kq.a(SourceFile:237)
Client> at bhq.run(SourceFile:114)
Client> at java.lang.Thread.run(Thread.java:680)
Client> Invalid memory access of location 0x1143de000 rip=0x1110c6740