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Your report omits some important details, such as which version of OS X you're using. Omni support isn't open on the weekends (and crash reports sent by the crash reporter software don't typically generate a response), so that may explain your lack of a response.

I'm able (under 10.7.4) to open the color chooser, close the application, and relaunch it without incident. I haven't tried Snow Leopard yet, and am not going to install Mountain Lion just for the sake of trying the experiment, but it suggests to me that perhaps not every system is affected. Have you tried creating a new user account and seeing if the problem persists there?