Shoutbox

First of all, go to "Internet Explorer's menu>Page or View>Text size" and set it to "medium" or higher.

If it doesn't solve, open Messenger Plus!'s Log Viewer and after clicking the view area of logs, keep Ctrl key pressed and scroll your mouse wheel until it gets bigger enough.

PS: Attaching screenshots with image extensions like *.png, *.jpg is better. To do so, use Paint program (Start>Accessories>Paint) instead of Microsoft Word.