After fix in rev. 1558 works searching fine anyway no fields are filled after choosing movie and no information is saved. All fields stay empty incl. poster.
Please provide an example movie name. I checked it with my movies and it works like a charm.
Additionaly you can provide the output of the debug start here:
griffith --debug
I tried to reproduce it. But I didn't have success.
I used a clean installation of 0.12.1 and the current version of the CSFD plugin. I got all the information for the movie.
Perhaps the upcoming version 0.13 will fix that error for you too.
Fixed in rev. 1558