Just reinstalled X1 (plus C). I swear my music sounds muddy compared to 8.53!

Well, the title says it all. I would swear that the song playback coming out of X1 Producer has a slightly muddy sound compared to 8.53. My songs consist of a combination of direct recorded instruments and a few midi tracks feeding Dim Pro and an occasional other VI.
 
Am I crazy, or are there default settings I'm not aware of, or both?
 
Thank you for any thoughts.

Be aware that many synths and effects have randomness built into them that will result in a different performance every time you play/bounce/freeze/export them, making it difficult to get perfect nulling with a complex project.

If an exported track won't null with the live playback when re-imported to the version from which it was exported, you'll need to look into saving a copy of the project with at least some synths and FX frozen before exporting from either. And don't forget to turn off dithering, though that should be audible only when you crank the levels.