I noticed lately that when shows are replaced by higher quality versions, its not deleting the older lesser quality version. Is this a option i am missing or is it maybe a bug? I cant recall how long this has been going on, but noticed this just recently and i remember it used to delete the older ones off the server.
Windows 8
2.0.0.709 Nzbdrone
Sounds like a bug, is it happening consistently? It would be great to get logs of it happening, I noticed it happened once some time, but since then it hasn’t happened again.
Without logs/consistent behaviour this might be a tough one to track down, so anything you have should be helpful.
ok will see what i can do for you 
I think I mentioned this before to you as well. It happened about 5 times with me so far, including today.
I will post my logs the next time it happens.