I have a Samsung Captivate and I want to change the fonts. When I go to Settings-Display-Font Style. I get a pop up box that gives me the choice to use the Default font or get fonts online. This takes me to the app center where I have downloaded free and paid for font apps over the last 3 days. They downloaded fine and when I went to install the message says could not download because it had not been obtain in the android market which is where I got them from. Talked to Samsung support and AT&T tech support. Both said it was the problem of the other one. What is the problem?