I tried to play 1.5.2 because there is a working mcp for that version.
But when I hit "Play" In the launcher, it disappears (As I set it to do so)
and opens the client, it stays black for 2-5 seconds, and then crashes!
I don't know what could be causing it, only the client output logs generate in my minecraft1.5.2 folder. And it works just fine with 1.6.2.
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Settings for the launcher profile

Please attach the complete output of the "Development console" of the launcher. CTRL-A, CTRL-C there, CTRL-V in the ticket.
If the launcher closes after game start, please edit your profile and select at "Launcher visibility" "Hide launcher and reopen" or "Keep the launcher open"
Please attach the crash report ( [minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-XXXX.txt
) if you get any.

Client> Invalid memory access of location 0x0 rip=0x0
That's a duplicate of MCL-90.
Was fixed with Launcher 1.0.8, probably that comes with MCP.
MCP 8.04 for 1.6.2 is working without problems, try this.