As soon as I open the plugin, Task Manager is telling, that AP is not responding. Interestingly after applying a filter / action, AP is getting back to a normal state and you can see, that the image was processed. Is G'MIC to blame or AP?
I could be wrong, but I have the impression, that the preview in G'MIC is better than the result when returning back to AP.
Regarding this sentence in the help files I am curious: "To enable untested or potentially unsupported plugins". Who is testing the plugins? Serif? The community? Or Serif, when problems are reported by the users?