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:
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
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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.

Duplicate of MC-6665
Please stop posting these are duplicates of other issues. Kindly post the resolution if there is one. Or let us know if there's no fix. Who has time to click through all the "duplicates of" - we just want a solution to this problem. I paid to purchase the Minecraft game and now my children can't play it cuz it freezes every time we click PLAY and it goes to FULLSCREEN. This is very frustrating. I'm not a computer techie and need a very simple, "do this, then do this, then do this" so that my sons can play this game that they love. Please post a solution, or let us know if there is no solution so that I may request a refund. Thank you kindly.
And I did the text edit to make the game not open in full screen - but who wants to play on a minimized window. So please let me know specifically if there's a fix to allow PLAY in FULLSCREEN MODE. Thank you!

@Kim:
Please stop posting these are duplicates of other issues.
Please stop posting duplicates. 😉
This site is a bug tracker, not a help forum or similar. Every issue should have excatly one ticket and the creator of this ticket didn't search to see if this issue has already been submitted.
This is something similar but it doesnt crash... just leaves it very weird: http://www.youtube.com/watch?v=IyIvOyU2aQs&feature=youtu.be
ALTHOUGH! this can be fixed by pressing the yellow button in the top right corner ➖ and then clicking the icon to get up the game again.