[vbat99]

This might be an issue with Plex and not so much MC3 - but I have to scrape the movie once, then "scan for media files" in Plex.  The movie shows up in Plex but just the actors names show up, no pictures.  If I go back to MC3, scrape specific, Actors then go back to Plex and refresh Metadata, the Actors portraits will show up.  
There's been so many updates to both Plex and MC3, I can't recall if it ever showed up the Actors pictures without the above process?

Also, side question, where in the heck is this thing pulling Movie tags from?  None of the tags that scrape with the movie has anything to do with said movie.  Some of the tags are downright comical. LOL  I just recently scrapped "The Meg" and some of the Tags were: "woman with masculine hair"

Not sure what is happening there, I do not have Plex.
I suggest you scape a new movie, import it into Plex, if there are no actor images, then make a Copy of the nfo and move it to a safe place, Then rescrape actors and import again into plex.
If the actor images appear, can you compare the original nfo and the recently updated nfo to see what differences there are.

If there are differences, please zip them, upload somewhere and PM me a link please.