I agree with Ted on this. The coolant level sensor is pretty sensitive, and when you flush & fill the cooling system, it takes lots of "burping" to get all the trapped air out of the system.
If you can get your hands on a cooling system pressure tester, you can do a quick pressure test to verify if you have a leak or not and find it. Basically this is a quick pressure leak down test - remove the radiator cap, replace it with pressure tester's cap, pump it up to the recommended pressure and watch its gauge for 10~15 minutes. If the pressure drops, you've got a leak - external leaks will be found wherever you see coolant peeing out; internal leaks may not be as easy to find, but if the pressure drops you've got a problem.
Check with your local auto parts chain shop or tool rental shop - you can probably rent a pressure tester for a reasonable cost; just have to make sure they have one with the right cap to fit your radiator.
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