I used the previous PE in 20.5 with no issue(in regard to Kodi db Trailers). I just recently upgraded to 21 and installed the 3.0a and experienced the same. I have been trying to figure it out for a bit now. In the settings of PE, its listed as Kodi(youtube) under sources. I have Trailers(locally saved) in 99.9% of my collection, but I also have youtube links included in the nfo's. PE is not pulling either. On testing/previewing, it will black screen and dump back to the editor. I also couldn't seem to get the debugging toggle to stick, plus I am currently at work... so no log.