6241 works fine on Netflix.
To help others help you, do the following.
1) With streamfab closed, find and delete StreamFab.log.
2) Go to one movie that gives you an issue, let it analyze, and it will either error, or you may have to finally stop it from analyzing.
3) Attach unaltered streamfab.log to a new post, and then either a Trusted Member or maybe a staff member can read the whole log to see what's going on.
If you don't want to do that, the bare minimum is to find the streamfab cache, rename the cache to cacheOLD as shown (here), and see if that helps.
You will then need to log back into Netflix, along with any other providers, as renaming the cache will cause you to be logged out of all providers.
OR one other thought, just try logging out of Netflix and then logging back in
If I get a chance to update to 6242, I will add to this if anything has changed.
6242 now checked and ok, you may find you need to refresh the page to get streamfab to analyze on Netflix properly.