My #1 iTunes computer is at home, my #2 iTunes computer is at work. Today I transferred a purchased song from my iPod to my computer at work. It told me to authorize the already authorized computer, and I did. It still thought there were the 3 authorized computers, that I knew about. I then bought a song, turned off auto-sync, and dragged it to my iPod. When I got home, I told it to transfer purchased songs. It said I couldn't, and told me to authorize the computer. I authorized it again, and tried transfering the purchases again. It told me I'm not authorized to play it on this computer, and told me again to authorize my computer. I repeated this cycle 4 times, without getting it transferred to my #1 computer. What do I do next?