I bought a Third Generation iPod last May when they came out. I have the 10GB without a dock. I finally bought a dock yesterday and I can't keep the iPod connected to the iMac, the iPod just won't fit into the dock tightly, do I need another dock? I went to the apple store and they said that it should work, it's just aggravating me. Has anyone else had this problem? Any help would be great.