I'm new to this whole tekkit launcher thing and when I clicked play on the attack of the B team for the first time, it took about 2 minutes to download some stuff and then when I clicked play for the second time, the launcher disappeared, then appeared again. I saw on some other help videos that it should open up another window like minecraft but with the modpack installed. That didn't happen for me. Could someone explain this or help? Sorry, I don't know much about the launcher.
I've just tried a few of the other modpacks, and they open minecraft, but Attack of the B Team still isn't working. :/