Found the problem/solution by accident.  I was logged into the computer with a different network user account than what was used to authenticate to the wireless.  When I switched the user account so the user account that was logged into the computer was the same that was authenticating to the wireless, it worked.  Go figure!
I have an XPS 12 with an Intel Centrino Advanced-N 6235 wireless card.  I can't ping the default gateway with the wireless card.  When I use a USB-Network adaptor, I can ping the default gateway for the wired connection.  I can connect to the Internet and internal network with the wireless card and can ping other computers on the network.  I am trying to run a program to connect wirelessly to a projector.  I have two different programs for two different projectors.  I can connect wired, but not wirelessly.  I'm thinking the problem is whatever is not allowing me to ping the default gateway or something on the wireless card.  I have a Latitude 10 with a Broadcom wireless card that is connected to the same AP and can ping the default gateway and can connect to both projectors wirelessly.  They both have Window 8 Pro.    I've downloaded the new drivers from Dell, uninstalled, reinstalled, tried to have Windows update install the drivers, all with no success. Any ideas?
Can't ping default gateway with Centrino Advanced-N 6235 on XPS 12 but CAN 
connect to Internet