I installed the plugin a few days ago, and I've noticed that it sometimes finds the wrong lyrics.
For example: today, I was playing "Can you read my mind" by The Killers and the lyrics that came back were for a song with the same name by Brian McKnight. Since "Brian McKnight" appears nowhere in the tags or the file name, I assumed that meant the plugin doesn't use the name of the artist (or album) in the search terms, and just returns the first one it finds by the name of the song alone.
Also, it seems to have a problem with non-standard characters, such as the backwards R in Ko?n. I recently changed it to the backwards R because Music Bee was telling me to "keep my tags clean" when attempting to get the cover art, but now that I've done that, the plugin can't find any lyrics for Ko?n because the web pages are expecting an English "R."
I considered looking at the source code myself, but the link is broken.