Greetings Pavel/killerdeveloper, and thank you for your diligent work with this excellent plugin.
The plugin works great on several of my sites, but on one it is being a bit stubborn and I can't isolate why...
As soon as I click the 'settings' link, and error pops up from the browser (both chrome and firefox) that states 'An error has occurred and your plugin is not working. If you are working on a local server, make sure you have an internet connection.'
The plugin partially works, as in I can still change fonts and size and color, but not every time and the changes don't always stick.
Just wanted to give you a heads up...
Theme used = Suffusion
I've tested by disabling all other plugins and it didnt help.
Cheers and thanks!