I just installed yahoo messenger on my computer, and it works fine on one of my user accounts on windows xp. On the other account, though, it doesn’t. If someone instant messages me, the IM window opens, but their message is not displayed. When I send them a message back, they get it and it is displayed on their computer, but it still doesn’t show that any messages have been sent or received in the part of the IM window that displays the ongoing conversation. What could be causing this?