After I installed the StuffPlug-NG plugin, I wanted to upload more emoticons. I clicked My Custom Emoticons and tried to upload this one smilie. It kept popping up saying whether or not I wanted to keep it the same size, and I kept saying yes. Everytime I clicked yes it would return back to the My Custom Emoticons menu, but the smilie wasn't added. So I clicked no the next time and it appeared, but zoomed in. I then clicked modify and clicked yes when the "do you want to keep the original size" popup came up, and it was the right size, so I closed the window.

But then when I went to add another custom emoticon, it wouldn't let me. I keep clicking "My Custom Emoticons" but nothing pops up. =\ I rebooted MSN, I restarted my computer.. I don't know!

sorry for such a late reply. What you can do is in the StuffPlug-NG Options disable Over Sized Emoticons when you are adding new ones.

Plus! > Preferences > Plugins > StuffPlug-NG > Configure > Uncheck Enable Oversized Emoticons

Hope this workaround works for you.