Shoutbox

This is a known Msn Messenger problem.

What i do is:

When i wish to see what is written above in the convo and it continuousely scrolls down, i highlight the text from the bottom of the convo, and use that to scroll up to the text i want to read. This usually stops the convo from scrolling all the way back down to the bottom.

Try that out. It might work for you, like it does for me