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Do you have the stock messaging client frozen or set to auto kill?
Dope.
That happened to me too. I honestly have no solution except to uninstall handcent and try again. at the point that I had that problem, I was SBFing once or twice a day anyway, so I'm not sure what actually fixed it, sorry.
a reboot usually fixed the double sending for me
Handcent has a new setting that adjusts the brightness based on the time
check under Settings, Application Settings, Display Mode
I think it might be buggy. Try emailing the dev.