INSTAGRAM PROBLEM RESOLVED!!!
I too had just purchased INSTAGRAM app for MAC and THOUGHT I couldn’t open it. So I contacted the developer and quickly got a response. He asked me to send him a screen shot. Which when I did, he quickly saw the problem. The icon is up at the top of the screen next to your wi fi symbol. I clicked on it and there is my INSTAGRAM!!!! Great support. Very helpful.
lacajungirl about
App for Instagram - App with Menu Bar Tab & Window Experience - It's About Time