Shoutbox

Cookie is right, the IM Text Size does have to do with this.

This is what I did to see what was going wrong on my machine:

1. Exit Live Messenger.

2. Deleted the entire "HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger\PerPassportSettings\<msnID>\" tree.

3. Restart Live Messenger. Keep regedit open to see changes as you change the preferences.

4. Set Font=Verdana; Bold, Size=8, Color=Gray. When I changed the font size and style the "IM Format" and "IM Text Size" values got created.

5. Open a chat window. "IM Text Size" gone! It was as if the Window open event waxed it.

Not knowing if this was a recurring issue, I recreated the "IM Text Size" Binary key with value "00 00 00 00".

Opened another window, key still there.

Exit Messenger, start Messenger, open chat window, key still there.

Changed font="Tahoma" keeping all other constant. Open new chat window. IM TEXT Size gone!

WHATS CAUSING THE PROBLEM: This behavior is observed any and everytime you change the font/size/style/color (using either  Tools->Options or Font settings in chat window). Seems like when you apply new changes, the IM Text Size key is discretely removed.