I found a bug with a plugin that I was able to correct, but I an unable to reach the author of the plugin, nor can I create an issue with it.
The icon does not display in the toolbar properly, yet a space is there and is clickable.
line 28 'icon' => '../../plugins/codebuttongs/image/code.png',
'icon' => '../../plugins/codebuttonmod1/image/code.png',
Code Button will now appear.