Had the same issue, but then looked at the screenshot of the app! Perfect now!

All the negative reviews have failed to look at the screenshot above.

I was clicking launch, over and over, and even re-started my computer, and I thought what is going on? I looked at screenshot above and then I looked in the top bar of my screen and realized it was there. Success!

I like this because I can compose tweets here on the Desktop page, and I can see them in my queue on my iPhone app so if I need to edit later on the go, it makes it easy!

Nice app!

Kurtis Powers about Buffer for Twitter and Social Media Scheduling