Hello, I have made a custom plugin and defined the icon via:
CKEDITOR.plugins.add('my_custom_plugin', {
requires : 'som_other',
icons : 'my_icon',
....
the icon is in under the icons folder of the above plugin..
The icon is shown but with inverted colors. The icon is a png file. Is there a chance that something is wrong with the png alpha channel? Or am I doing something wrong? Help is very much appreciated!