I am on version .12.2.1 and nothing happens when I choose a shader on an image.
Please don't trouble yourself. If it's just me having the issue, no worries.
However, would like and maybe something I can help with is some more tutorials. I am a beginner at pixelart/animations and to get more user adoption it might be helpful to at least make your clicks and selections in the videos/tutorials more clear.
Other than that, this software is really fun to use. Great job!