The toolbar editor calls for an icon for the smiley tool that does not exist (/img/smiles/icon_smile.png). This results in the text "smile" being displayed instead of the proper icon.
However, a /img/smiles/icon_smile.gif exists (GIF instead of PNG).
I did not find a particular PHP or .tpl that calls this icon as a PNG, so I suspect the entirety of tool icons are called by name and added extension .png. So instead of searching for the bug in the source code, and coding an exception just for the smiley icon, it would be much easier to simply create a copy of /img/smiles/icon_smile.gif in PNG format in /img/smiles directory to rectify this...
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To help developers solve the bug, we kindly request that you demonstrate your bug on a show.tikiwiki.org instance. To start, simply select a version and click on "Create show.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show.tikiwiki.org.