Having some trouble connecting my Due to Arduino 1.8.1 (running Win7Pro). Installed the 'Arduino SAM Boards (32-bits ARM Cortex-M3)' version 1.6.11 using the Boards Manager. I believe the comm. driver is installed and I have the Due connected to one of my USB ports. Have my Due connected via the standard programming port. When I select the 'Arduino Due (Programming Port)' board under Tools->Board, it does not allow me to select the Port. The Port selection is grayed out. It appears to be recognizing the Due, since it is listing 'Arduino Due (Programming Port) on COM19' at the bottom of the IDE screen.
Any ideas why the Port option is grayed out? How can I select the comm. port? Appreciate any help.