Could you be a bit more specific as to the issue? Do the windows roll down when you engage the top operation? Does any other switch on the console flash along with the top open switch?

Don't know how long you've owned the car, but the top will not open if the trunk is opened or the canopy compartment in the trunk is not shut.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car