Id bet that the liquid didnt effectively wick into the coils. Being a top coil design, you want to be sure that the coil is saturated before vaping.
Im using Bottom Coil design, like the Evod, and even with that, after I fill a fresh one, I let it stand up on my desk for a bit before I vape it. I also take a couple dry pulls through the mouthpiece to make sure the juice is in the wicks nice and proper. With a Top Coil design, where you lose the gravity fed aspect, you want to be even more sure.
ALSO, you should give the tank and the wicks a rinse before using them if they're brand new. I learned that the hard way on a brand new Evo.. REALLY wierd taste.
Course, the coil could have blown too. Only way to know it to check it.