v31 is old. You need the latest files, v33 from this
news announcement. Simply extract that .zip file to your base everquest folder (IE: C:\Everquest).
I would also recommend *not* playing in full-screen mode. EQ was not made for multitasking, it may not like (read: it may crash) you alt-tabbing out of full-screen mode. I play windowed at full resolution (aka a window border around a 1920x1080 window).