[vbat99]

Interesting. Could be you've set MC to be using TVDB Api V1 still. Will get this corrected.  

Didn't notice, but, you are correct.  I had V1 selected.  V2 rescraped episodes and fixed the problem with episode titles but not plot. 

Am I remembering incorrectly?  Weren't we able to drag and drop folders into the list of root folders? 

 And how do you select v2?

In Tv Preferences, above the Apply button, uncheck Use TVDb api V1 to use V2 api.
NB, V2 api is still a work in progress at TVDb, but does return the latest data.