I tried the suggestion of restarting the computer in safe mode and turning off all my monitors but one and it still would not allow me to make more than one mapping selection. I finally figured it out. The FAM mapping screen is simply broken in terms of using the mouse to click on the drop down arrow and then clicking on the field you want to map. When you do this, you'll notice that the entire name of the field does not get selected. Instead, it only selects the first few letters and is not truly making an actual selection. That is why it will not allow you to move on to another field to map the next field in your import. It still does not consider the first field to be mapped. You have to actually click within your mouse in the middle of the selection you made (which is currently not fully spelled out) and then backspace and type out the selection you want. When you type enough letters, you can then press tab and it will fill in the rest of the mapped field name and allow you to move on to the next field, for which you'll need to repeat the same process.
