Using the latest GIMP AppImage I found following bugs:
To reproduce:
Open a raw file by right click in file manager on that file and select ‘open with GIMP AppImage’
=> GIMP starts, PhotoFlow plugin starts, fine.
Now close PhotoFlow plugin using the ‘x’
=> PhotoFlow plugin closes and GIMP shows this message
When closing PhotoFlow plugin using the ‘Cancel’ button instead of ‘x’ GIMP shows this message
Edit: I forgot to mention that it works fine when I use the ‘Ok’ button to close the PhotoFlow plugin