I've opened Minecraft 1.7 the first time, and when i pressed a key, Minecraft closed and i get the error window from Mac with the Crash Report.
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What java version is Minecraft using? Although you state 7 u 45, there is no apple release for this version (highest is 6 u 65).
Please attach the complete output of the "Development console" tab of the launcher.
Click the text, press CTRL-A to select all, then CTRL-C to copy, and CTRL-V to paste in a comment on this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".
Could you instead include your Minecraft crash report?